Hiroyuki Kokawa, Ph.D.
Professor
Department of Materials Processing
Graduate School of Engineering
Tohoku University
6-6-02 Aramaki-aza-Aoba
Aoba-ku, Sendai 980-8579
Japan

E-mail: kokawa@tohoku.ac.jp
Tel: +81-22-795-7351
Fax: +81-22-795-7351

Professional Societies

Japan Welding Society
Japan Institute of Metals and Materials
Iron and Steel Institute of Japan
Japan Light Metals Welding & Construction Association
Japan Institute of Light Metals
American Welding Society
The Minerals, Metals and Materials Society

Publications

Hiromichi T. Fujii, Yuta Goto, Yutaka S. Sato，Hiroyuki Kokawa, Microstructure and lap shear strength of the weld interface in ultrasonic welding of Al alloy to stainless steel, Scripta Materialia, 116 (2016), 135-138. DOI: 10.1016/j.scriptamat.2016.02.004
Y.S. Sato, H. Kokawa, H.T. Fujii, Y. Yano, Y. Sekio, Mechanical properties and microstructure of dissimilar friction stir welds of 11Cr-ferritic/martensitic steel to 316 stainless steel, Metallurgical Materials Transactions A, 46-12 (2015), 5789-5800. DOI: 10.1007/s11661-015-3152-5
S. Mironov, T. Onuma, Y.S. Sato, H. Kokawa, Microstructure evolution during friction-stir welding of AZ31 magnesium alloy, Acta Materialia, 100 (2015), 301-312. DOI: 10.1016/j.actamat.2015.08.066
S. Tokita, M. Ikeshoji, G. Yamada, K. Kurihara, H. Kokawa, Y.S. Sato, H.T. Fujii, Effect of post-GBE strain on weld decay resistance of grain boundary engineered 304 austenitic stainless steel, Science and Technology of Welding and Joining, 20-8 (2015), 702-707. DOI: 10.1179/1362171815Y.0000000061
S. Mironov, K. Inagaki, Y.S. Sato, H. Kokawa, Microstructural evolution of pure copper during friction-stir welding, Philosophical Magazine, 95-4 (2015), 367-381. DOI: 10.1080/14786435.2015.1006293
S. Mironov, K. Inagaki, Y.S. Sato, H. Kokawa, Effect of welding temperature on microstructure of friction stir welded aluminum alloy 1050, Metallurgical and Materials Transactions A, 46A-2 (2015), 783-790. DOI: 10.1007/s11661-014-2651-0
S. Mironov, K. Inagaki, Y.S. Sato, H. Kokawa, Development of grain structure during friction-stir welding of Cu-30Zn brass, Philosophical Magazine, 94-27 (2014), 3137-3148. DOI: 10.1080/14786435.2014.951712
S. Shimizu, H.T. Fujii, Y.S. Sato, H. Kokawa, M.R. Sriraman, S.S. Babu, Mechanism of weld formation during very-high-power ultrasonic additive manufacturing of Al alloy 6061, Acta Materialia, 74 (2014), 234-243. DOI: 10.1016/j.actamat.2014.04.043
P. Hua, S. Mironov, C.Z. Nie, Y.S. Sato, H. Kokawa, S.H.C. Park, S. Hirano, Microstructure and properties in friction stir weld of 12Cr steel, Science and Technology of Welding and Joining, 19-1 (2014), 76-81. DOI: 10.1179/1362171813Y.0000000167
Shuji Hanada, Naoya Masahashi, Taek Kyun Jung, Masahiro Miyake, Yutaka S. Sato, Hiroyuki Kokawa, Effect of swaging on Young’s modulus of β Ti-33.6Nb-4Sn alloy, Journal of the Mechanical Behavior of Biomedical Materials, 32 April (2014), 310-320. DOI: 10.1016/j.jmbbm.2013.10.02
Y. Yano, Y.S. Sato, Y. Sekio, S. Ohtsuka, T. Kaito, R. Ogawa, H. Kokawa, Mechanical properties of friction stir welded 11Cr-ferritic/martensitic steel, Journal of Nuclear Materials, 442-(1-3) (2013), S524-S528. doi:10.1016/j.jnucmat.2012.10.038
J.J. Jeon, S. Mironov, Y.S. Sato, H. Kokawa, S.H.C. Park, S. Hirano, Grain structure development during friction stir welding of single-crystal austenitic stainless steel, Metallurgical and Materials Transactions A, 44-7 (2013), 3157-3166. DOI: 10.1007/s11661-013-1692-0.
G. Yamada, H. Kokawa, Y. Yasuda, S. Tokita, T. Yokoyama, Y.S. Sato, H.T. Fujii, S. Tsurekawa, Effect of post-GBE strain-sensitisation on corrosion resistance of grain boundary engineered 304 austenitic stainless steel, Philosophical Magazine, 93-10/12 (2013), 1443-1453. DOI:10.1080/14786435.2012.762467
J. Jeon, S. Mironov, Y.S. Sato, H. Kokawa, S.H.C. Park, S. Hirano, Anisotropy of structural response of single crystal austenitic stainless steel to friction-stir welding, Acta Materialia, 61-9 (2013), 3465-3472. DOI: 10.1016/j.actamat.2013.02.039
Y. Zhao, A.P. Wu, J.L. Ren, Y.S. Sato, H. Kokawa, M. Miyake, D.Y. Yan, Temperature and force response characteristics of friction stir welding on Invar 36 alloy, Science and Technology of Welding and Joining, 18-3 (2013), 232-238. DOI: 10.1179/1362171812Y.0000000077
S. Mironov, K. Masaki, Y.S. Sato, H. Kokawa, Texture produced by abnormal grain growth in friction-stir welded aluminum alloy 1050, Metallurgical and Materials Transactions A, 44-3 (2013), 1153-1157. DOI: 10.1007/s11661-012-1596-4
N. Sakaguchi, M. Endo, S. Watanabe, H. Kinoshita, S. Yamashita, H. Kokawa, Radiation-induced segregation and corrosion behavior on Σ3 coincidence site lattice and random grain boundaries in proton-irradiated type-316L austenitic stainless steel, Journal of Nuclear Materials, Journal of Nuclear Materials, 434-1-3 (2013), 65-71. doi:10.1016/j.jnucmat.2012.11.036
S. Saito, K. Kikuchi, D. Hamaguchi, M. Tezuka, M. Miyagi, H. Kokawa, S. Watanabe, Corrosion-erosion test of SS316L grain boundary engineering material (GBEM) in lead bismuth flowing loop, Journal of Nuclear Materials, 431-1-3 (2012), 91-96. doi:10.1016/j.jnucmat.2011.11.040
Masayoshi Kawai, Hiroaki Kurishita, Hiroyuki Kokawa, Seiichi Watanabe, Norihito Sakaguchi, Kenji Kikuchi, Shigeru Saito, Toshimasa Yoshiie, Hiroshi Iwase, Takahiro Ito, Satoshi Hashimoto, Yoshihisa Kaneko, Masatoshi Futakawa, Shiori Ishino and JSPS Grant Team, Development of Advanced Materials for Spallation Neutron Sources and Radiation Damage Simulation Based on Multi-Scale Models, Journal of Nuclear Materials, 431-1-3 (2012), 16-25. DOI: 10.1016/j.jnucmat.2011.11.023
S. Mironov, K. Masaki, Y.S. Sato, H. Kokawa, Relationship between material flow and abnormal grain growth in friction stir-welds, Scripta Materialia, 67-12 (2012), 983-986. DOI: 10.1016/j.scriptamat.2012.09.002
Yutaka S. Sato, Yoshito Nagahama, Sergey Mironov, Hiroyuki Kokawa, Seung Hwan C. Park, Satoshi Hirano, Microstructural studies of friction stir welded Zircaloy-4, Scripta Materialia, 67-3 (2012), 241-244. DOI: 10.1016/j.scriptamat.2012.04.029
Y.S. Sato, S. Kurihara, H. Kokawa, Systematic examination of precipitation phenomena associated with hardness and corrosion properties in friction stir welded aluminum alloy 2024, Welding in the World, 55-11/12 (2011), 39-47.
J. Jeon, S. Mironov, Y.S. Sato, H. Kokawa, S.H.C. Park, S. Hirano, Friction-stir spot welding of single crystal austenitic stainless steel, Acta Materialia, 59-20 (2011), 7439-7449. DOI:10.1016/j.actamat.2011.09.013
Yue Zhao, Yutaka S. Sato，Hiroyuki Kokawa，Aiping Wu, Microstructure characteristics and properties of friction stir welded Fe-36wt%Ni alloy, Materials Science and Engineering A, 528-25/26 (2011), 7768-7773. doi:10.1016/j.msea.2011.06.082
S. Mironov, Y.S. Sato, H. Kokawa, H. Inoue, S. Tsuge, Structural response of superaustenitic stainless steel to friction stir welding, Acta Materialia, 59-14 (2011), 5472-5481. DOI 10.1016/j.actamat.2011.05.021
M. Sekine, N. Sakaguchi, M. Endo, H. Kinoshita, S. Watanabe, H. Kokawa, S. Yamashita, Y. Yano, M. Kawai, Grain boundary engineering of austenitic steel PNC316 for use in nuclear reactors, Journal of Nuclear Materials, 414-2 (2011), 232-236. doi:10.1016/j.jnucmat.2011.03.049
D.H. Choi, B.W. Ahn, Y.M. Yeon, S.H.C. Park, Y.S. Sato, H. Kokawa and S.B. Jung, Microstructural Characterizations Following Friction Stir Welding of Dissimilar Alloys of Low- and High-Carbon Steels, Materials Transactions, 52-7 (2011), 1500-1505. DOI: 10.2320/matertrans.M2010438
H. Kokawa, Potential of grain boundary engineering to suppress welding degradations of austenitic stainless steels, Science and Technology of Welding and Joining, 16-4 (2011), 357-362. (invited paper to Special issue celebrating 1000 articles published in STWJ)　DOI 10.1179/1362171811Y.0000000021
K. Kurihara, H. Kokawa, S. Sato, Y.S. Sato, H.T. Fujii, M. Kawai, Grain boundary engineering of titanium-stabilized 321 austenitic stainless steel, Journal of Materials Science, 46-12 (2011), 4270-4275. DOI: 10.1007/s10853-010-5244-3
Z.J. Wang, Y.N. Chen, Y. Otsuka, M.W. Zhu, Z.P. Cao, H. Kokawa, Crystallization of ferroelectric lead zirconate titanate thin films by microwave annealing at low temperatures, Journal of the American Ceramic Society, 94-2 (2011), 404-409. DOI: 10.1111/j.1551-2916.2010.04094.x
M. Kondo, H. Nagata, A. Nishimura, H. Kokawa, Degradation mechanism of electrode tip during resistance spot welding of aluminium alloy sheets, Science and Technology of Welding and Joining, 16-2 (2011), 126-132. DOI 10.1179/136217111X12972560551725
S. Mironov, Y.S. Sato, H. Kokawa, Microstructural evolution during friction stir welding of Ti-15V-3Cr-3Al-3Sn alloy, Materials Science and Engineering A, 527/29-30 (2010), 7498-7504. doi:10.1016/j.msea.2010.08.074
Y. Zhang, Y.S. Sato, H. Kokawa, S.H.C. Park and S. Hirano, Grain structure and microtexture in friction stir welded commercial purity titanium, Science and Technology of Welding and Joining, 15-6 (2010), 500-505. DOI 10.1179/136217110X12785889549624
Y.S. Sato, A. Shiota. H. Kokawa, K. Okamoto, Q. Yang and C. Kim, Effect of interfacial microstructure on lap shear strength of friction stir spot weld of aluminium alloy to magnesium alloy, Science and Technology of Welding and Joining, 15-4 (2010), 319-324. DOI 10.1179/136217109X1256813262420
D.-H. Choi, C.-Y. Lee, B.-W. Ahn, Y.-M. Yeon, S.-H.C. Park, Y.S-. Sato, H. Kokawa and S.-B. Jung, Effect of fixed location variation in friction stir welding of steels with different carbon contents, Science and Technology of Welding and Joining, 15-4 (2010), 299-304. DOI 10.1179/136217109X12577814486737
D.-H. Choi, C.-Y. Lee, B.-W. Ahn, Y.-M. Yeon, S.-H.C. Park, Y.S-. Sato, H. Kokawa and S.-B. Jung, Effect of fixed location variation in friction stir welding of steels with different carbon contents, Science and Technology of Welding and Joining, 15-4 (2010), 299-304. DOI 10.1179/136217109X12577814486737
Wei Zhong Jin, Hiroyuki Kokawa, Zhan Jie Wang, Yutaka S. Sato and Nobuyoshi Hara, Improvement of transpassive intergranular corrosion resistance of 304 austenitic stainless steel by thermomechanical processing for twin-induced grain boundary engineering, ISIJ International, 50-3 (2010), 476-481. doi:10.2355/isijinternational.50.476
M. Kondo, T. Konishi, K. Nomura, H. Kokawa, Degradation mechanism of electrode tip during alternate resistance spot welding of zinc-coated and uncoated steel sheets, Science and Technology of Welding and Joining, 15-1 (2010), 76-80. DOI: 10.1179/136217109X12577814486656
M. Kondo, T. Konishi, K. Nomura, H. Kokawa, Degradation mechanism of electrode tip during alternate resistance spot welding of zinc-coated and uncoated steel sheets, Science and Technology of Welding and Joining, 15-1 (2010), 76-80. DOI: 10.1179/136217109X12577814486656
S. Mironov, Q. Yang, H. Takahashi, I. Takahashi, K. Okamoto, Y.S. Sato, H. Kokawa, Specific character of material flow in near-surface layer during friction stir processing of AZ31 magnesium alloy, Metallurgical and Materials Transactions A, 41-4 (2010), 1016-1024. DOI: 10.1007/s11661-009-0158-x
U.F.H.R. Suhuddin, S. Mironov, Y.S. Sato, H. Kokawa, Grain structure and texture evolution during friction stir welding of thin 6016 aluminum alloy sheets, Materials Science and Engineering A, 527-7/8 (2010), 1962-1969. doi:10.1016/j.msea.2009.11.029
T. Huang, Y.S. Sato, H. Kokawa, M.P. Miles, K. Kohkonen, B. Siemssen, R.J. Steel, and S. Packer, Microstructural Evolution of DP980 Steel During Friction Bit Joining, Metallurgical and Materials Transactions A, 40-12 (2009), 2994-3000. DOI: 10.1007/s11661-009-0016-x
Zhan Jie Wang, Yuka Otsuka, Zhiping Cao and Hiroyuki Kokawa, Electrical Properties and Microstructure of Low-Temperature-Crystallized Lead Zirconate Titanate Thin Films Prepared by 2.45 GHz Microwave Irradiation, Japanese Journal of Applied Physics, 48 (2009), 09KA01. DOI: 10.1143/JJAP.48.09KA01
U.F.H.R. Suhuddin, S. Mironov, Y.S. Sato, H. Kokawa, C.W. Lee, Grain structure evolution during friction stir welding of AZ31 magnesium alloy, Acta Materialia, 57-18 (2009), 5406-5418. DOI:10.1016/j.actamat.2009.07.041
R. Ohashi, M. Fujimoto, S. Mironov, Y.S. Sato and H. Kokawa, Microstructural Characterization of High-Strength Steel Lap Joint Produced by Friction Spot Joining, Metallurgical and Materials Transactions A, 40-9 (2009), 2033-2035.
S. Mironov, Y.S. Sato, H. Kokawa, Development of grain structure during friction stir welding of pure titanium, Acta Materialia, 57-15 (2009), 4519-4528.
R. Ohashi, M. Fujimoto, S. Mironov, Y.S. Sato, H. Kokawa, Friction spot joining of high strength steel sheets for automotives, Welding in the World, 53-5/6 (2009), 23-27.
Y. Zhang, Y.S. Sato, H. Kokawa, S. Hirano, S.H.C. Park, Microstructure and Mechanical Properties of Friction Stir Welded Ti-15V-3Al-3Cr-3Sn Alloy, Proceedings of the 8th International Conference on Trends in Welding Research, edited by S.A. David, T. DebRoy, J.N. DuPond, T. Koseki, H.B. Smartt, ASM International, June 1-6, 2008, Callaway Gardens Resort, Pine Mountain, Georgia, USA, (2009), p.413-416.
H. Kokawa, M. Michiuchi, M. Shimada, Z.J. Wang, Y.S. Sato, Grain Boundary Engineering of Austenitic Stainless Steels, Proceedings of the 8th International Conference on Trends in Welding Research, edited by S.A. David, T. DebRoy, J.N. DuPond, T. Koseki, H.B. Smartt, ASM International, June 1-6, 2008, Callaway Gardens Resort, Pine Mountain, Georgia, USA, (2009), p.11-16.
Yutaka S. Sato, Kei Nakamura, Hiroyuki Kokawa, Shuji Narita, Tetsuya Shimizu, Microstructure and properties of friction stir welded 1.3wt%N containing steel, Proceedings of Friction Stir Welding and Processing-V Symposium, TMS 2008 Meeting, Edited by R.S. Mishra, T.J. Lienert, M.W. Mahoney February 15-19, 2009, San Francisco, CA, USA, (2009), 67-73.
R. Ohashi, M. Fujimoto, S. Mironov, Y.S. Sato and H. Kokawa, Effect of contamination on microstructure in friction stir welded DP590 steel, Science and Technology of Welding and Joining, 14-3 (2009), 221-227.
Y.S. Sato, N. Harayama, H. Kokawa, H. Inoue, Y. Tadokoro and S. Tsuge, Evaluation of microstructure and properties in friction stir welded superaustenitic stainless steel, Science and Technology of Welding and Joining, 14-3 (2009), 202-209.
Sergey Mironov, Yutaka S. Sato and Hiroyuki Kokawa, Applications of EBSD to Microstructural Control in Friction Stir Welding/Processing (Chapter 21), in “Electron Backscatter Diffraction in Materials Science (Second Edition)”, edited by Adam J. Schwartz, Mukul Kumar, Brent L. Adams and David P. Field, Springer, (2009), 291-300.
S.H.C. Park, Y.S. Sato, H. Kokawa, K. Okamoto, S. Hirano and M. Inagaki, Boride formation induced by pcBN tool wear in friction-stir-welded stainless steels, Metallurgical Materials Transactions A, 40-3 (2009), 625-636.
Z.J. Wang, Y. Otsuka, Z. Cao, M.W. Zhu, N. Yoshikawa and H. Kokawa, Low-temperature processing of PZT thin films by 2.45 GHz microwave heating, Proceedings of SPIE on Smart Materials V, edited by N.H. Voelcker and H.W. Thissen icolas The International Society of Optical Engineering, Vol.7267 (2008), 726702-1～8.
Z.J. Wang, T. Kumagai, H. Kokawa, M. Ichiki, R. Maeda, Preparation of hafnium oxide thin films by sol-gel method, Journal of Electroceramics, 21-1～4 (2008), 499-502.
M. Fujimoto, S. Koga, N. Abe, Y.S. Sato and H. Kokawa, Microstructural analysis of stir zone of Al alloy produced by friction stir spot welding, Science and Technology of Welding and Joining, 13-7 (2008), 663-670.
Z.J. Wang, Y. Otsuka, Z. Cao, N. Yoshikawa and H. Kokawa, Rapid Crystallization of Sol-Gel-Deposited Lead Zirconate Titanate Thin Films by 2.45 GHz Microwave Irradiation, Japanese Journal of Applied Physics, 47-9 (2008), 7519-7522.
Z.J. Wang, Z.P. Cao, Y. Otsuka, N. Yoshikawa, H. Kokawa and S. Taniguchi, Low-temperature growth of ferroelectric lead zirconate titanate thin films using the magnetic field of low power 2.45 GHz microwave irradiation, Applied Physics Letters, 92-22 (2008), 222905-1-3.
S. Mironov, Y. Zhang, Y.S. Sato and H. Kokawa, Crystallography of transformed b microstructure in friction stir welded Ti-6Al-4V alloy, Scripta Materialia, 59-5 (2008), 511-514.
M. Kawai, H. Kokawa, M. Michiuchi, H. Kurishita, T. Goto, M. Futakawa, T. Yoshiie, A. Hasegawa, S. Watanabe, T. Yamamura, N. Hara, A. Kawasaki and K. Kikuchi, Present status of study on development of materials resistant to radiation and beam impact, Journal of Nuclear Materials, 377-1 (2008), 21-27.
S. Mironov, Y.S. Sato and H. Kokawa, Microstructural evolution during friction stir processing of pure iron, Acta Materialia, 56-11 (2008), 2602-2614.
Y. Zhang, Y.S. Sato, H. Kokawa, S.H.C. Park and S. Hirano, Stir zone microstructure of commercial purity titanium friction stir welded using pcBN tool, Materials Science and Engineering A, 488-1/2 (2008), 25-30.
Kunitaka Masaki, Yutaka S. Sato, Masakatsu Maeda and Hiroyuki Kokawa, Experimental Estimation of Strain Rate during FSW of Al-Alloy using Plane-Strain Compression, Materials Science Forum, 580-582 (2008), 299-302.
Hiroyuki Kokawa, Seung Hwan C. Park, Yutaka S. Sato, Kazutaka Okamoto, Satoshi Hirano, and Masahisa Inagaki, Microstructural Evolution in 304 Austenitic Stainless Steel during Friction Stir Welding, Materials Science Forum, 580-582 (2008), 9-12.
S. Mironov, Y. Zhang, Y.S. Sato and H. Kokawa, Development of grain structure in beta-phase field during friction stir welding of Ti-6Al-4V alloy, Scripta Materialia, 59-1 (2008), 27-30.
Y. Zhang, Y.S. Sato, H. Kokawa, S.H.C. Park and S. Hirano, Microstructural characteristics and mechanical properties of Ti-6Al-4V friction stir welds, Materials Science and Engineering A, 485-1/2 (2008), 448-455.
Y.S. Sato, P. Arkom, H. Kokawa, T.W. Nelson and R.J. Steel, Effect of microstructure on properties of friction stir welded Inconel Alloy 600, Materials Science and Engineering A, 477-1/2 (2008), 250-258.
Kunitaka Masaki, Yutaka S. Sato, Masakatsu Maeda and Hiroyuki Kokawa, Experimental simulation of recrystallized microstructure in friction stir welded Al alloy using plane-strain compression test, Scripta Materialia, 58-5 (2008), 355-360.
Sen Yang, Zhan Jie Wang, Hiroyuki Kokawa and Yutaka S. Sato: Reassessment of the effects of laser surface melting on IGC of SUS 304, Materials Science and Engineering A, 474-1/2 (2008), 112-119.
Yutaka S. Sato, Hideaki Yamanoi, Hiroyuki Kokawa and Tadashi Furuhara, Characteristics of microstructure in ultrahigh carbon steel produced during friction stir welding, ISIJ International, 48-1 (2008), 71-76.
W.Z. Jin, S. Yang, H. Kokawa, Z.J. Wang, Y.S. Sato, Improvement of intergranular stress corrosion crack susceptibility of austenite stainless steel through grain boundary engineering, Journal of Materials Science and Technology, 23-6 (2007), 785-789.
S. Yang, H. Kokawa and Z.J. Wang: Effects of Laser Processing Parameters on Grain Boundary Character Distribution and Corrosion Resistance of Austenitic Stainless Steel, Materials Science Forum, 561-565 (2007), 2473-2476.
H. Kokawa, M. Shimada, M. Michiuchi, Z.J. Wang and Y.S. Sato, Arrest of weld-decay in 304 austenitic stainless steel by twin-induced grain boundary engineering, Acta Materialia, 55-16 (2007), 5401-5407.
Y.S. Sato, H. Yamanoi, H. Kokawa and T. Furuhara, Microstructural evolution of ultrahigh carbon steel during friction stir welding, Scripta Materialia, 57-6 (2007), 557-560.
Y.S. Sato, H. Watanabe and H. Kokawa, Grain growth phenomena in friction stir welded 1100 Al during post-weld heat treatment, Science and Technology of Welding and Joining, 12-4 (2007), 318-323.
Zhan Jie Wang, Hirokazu Usuki, Toshihide Kumagai and Hiroyuki Kokawa, Microstructure and electrical properties of lead zirconate titanate thin films deposited by sol-gel method on La_0.7Sr_0.3MnO₃ /SiO₂/Si substrate, Journal of Sol-Gel Science and Technology, 42-3 (2007), 375-379.
Sen Yang, Zhan Jie Wang, Hiroyuki Kokawa Yutaka S. Sato: Grain boundary engineering of 304 stainless steel by laser surface melting and annealing, Journal of Materials Science, 42-3 (2007), 847-853.
H. Kokawa, W. Z. Jin, Z. J. Wang, M. Michiuchi, Y. S. Sato, W. Dong and Y. Katada: Grain Boundary Engineering of High Nitrogen Austenitic Stainless Steel, Materials Science Forum, 539-543 (2007), 4962-4967.
S. H. C. Park, Y. S. Sato, H. Kokawa, K. Okamoto, S. Hirano and M. Inagaki: Microstructure of Friction-Stir-Welded High-Nitrogen Stainless Steel, Materials Science Forum, 539-543 (2007), 3757-3762.
Y. S. Sato, A. Sasaki, A. Sugimoto, A. Honda and H. Kokawa: Enhancement of Formability in Magnesium Alloy AZ31B Via Friction Stir Processing, Materials Science Forum, 539-543 (2007), 3775-3780.
M. Michiuchi, H. Kokawa, Z.J. Wang, Y.S. Sato and K. Sakai: Twin-induced grain boundary engineering for 316 austenitic stainless steel, Acta Materialia, 54-19 (2006), 5179-5184.
Masayoshi Kawai, Hiroyuki Kokawa, Hiroshi Okamura, Akira Kawasaki, Tsutomu Yamamura, Nobuyoshi Hara, Noboru Akao, Masatoshi Futakawa and Kenji Kikuchi: Development of resistant materials to beam impact and radiation damage, Journal of Nuclear Materials, 356-1-3 (2006), 16-26.
Zhan Jie Wang, Hirokazu Usuki, Toshihide Kumagai and Hiroyuki Kokawa, Microstructure and electrical properties of La_0.7Sr_0.3MnO₃ thin films deposited by metallo-organic decomposition method, Journal of Crystal Growth, 293-1 (2006), 68-73.
Zhan Jie Wang, Toshihide Kumagai and Hiroyuki Kokawa, Microstructure and electrical properties of lanthanum nickel oxide thin films deposited by metallo-organic decomposition method, Journal of Crystal Growth, 290-1 (2006), 161-165.
Y. S. Sato, M. Urata, Y. Kurihara, S. H. C. Park, H. Kokawa, K. Ikeda and N. Tsuji: Microstructural Evolution during Friction Stir Welding of Ultrafine Grained Al Alloys, Materials Science Forum, 503-504 (2006), 169-174.
Wei Dong, Hiroyuki Kokawa, Susumu Tsukamoto and Yutaka S. Sato: Nitrogen Desorption by High-Nitrogen Steel Weld Metal during CO₂ Laser Welding, Metallurgical and Materials Transactions B, 36B-5 (2005), 677-681.
Zhan Jie Wang, Hiroyuki Kokawa, Hirotsugu Takizawa, Masaaki Ichiki and Ryutaro Maeda: Electrical Properties and Microstructures of Sol-Gel-Deposited Lead Zirconate Titanate Thin Films Crystallized by 28GHz Microwave Irradiation, Japanese Journal of Applied Physics, Part 1, 44-9B (2005), 6914-6917.
Yutaka S. Sato, Hideaki Takauchi, Seung Hwan C. Park and Hiroyuki Kokawa: Characteristics of the kissing-bond in friction stir welded Al alloy 1050, Materials Science and Engineering A, 405-1/2 (2005), 333-338.
Hiroyuki Kokawa, Seung Hwan C. Park, Yutaka S. Sato, Kazutaka Okamoto, Satoshi Hirano and Masahisa Inagaki: Microstructural Evolution in Austenitic Stainless Steels during Friction Stir Welding, Proceedings of the 8th Inter-University Research Seminar (IURS) on Science and Technology of Welding and Joining, Frontiers of Welding and Joining - Processes, Materials, and Automation for the Future, edited by Q.Chen, Y. Zhou, D.Du, A. Wu, H. Zhao, B. Chang, Tsinghua University, Beijing, China, August 15-16, 2005, 135-147.
S. H. C. Park, Y. S. Sato, H. Kokawa, K. Okamoto, S. Hirano and M. Inagaki: Microstructural characterisation of the stir zone containing residual ferrite in friction stir welded 304 austenitic stainless steel, Science and Technology of Welding and Joining, 10-5 (2005), 550-556.
Zhan Jie Wang, Toshihide Kumagai, Hiroyuki Kokawa, Jiunnjye Tsuaur, Masaaki Ichiki and Ryutaro Maeda, Crystalline phases, microstructures and electrical properties of hafnium oxide films deposited by sol-gel method, Journal of Crystal Growth, 281-2/4 (2005), 452-457.
Sen Yang, Wenjin Liu, Minlin Zhong, Zhan Jie Wang, Hiroyuki Kokawa. Fabrication of in-situ synthesized TiC particles reinforced composite coating by powder feeding laser cladding, Journal of Materials Science, 40-9/10 (2005), 2751-2754.
Yutaka S. Sato, Pisuit Arkom, Seung Hwan C. Park, Hiroyuki Kokawa, Tracy W. Nelson, Russell J. Steel: Properties and microstructure of friction stir welded Inconel Alloy 600, Proceedings of High Performance Materials Symposium on Advanced Welding of Structural Materials at the 15th International Offshore and Polar Engineering Conference (ISOPE 2005), Seoul, Korea, June 19-24, 2005, Vol. IV, pp. 13-17.
Seung Hwan C. Park, Yutaka S. Sato, Hiroyuki Kokawa, Kazutaka Okamoto, Satoshi Hirano and Masahisa Inagaki: Microstructure and mechanical properties of friction stir welded 430 stainless steel, Proceedings of High Performance Materials Symposium on Advanced Welding of Structural Materials at the 15th International Offshore and Polar Engineering Conference (ISOPE 2005), Seoul, Korea, June 19-24, 2005, Vol. IV, pp. 6-12.
Z. J. Wang, H. Kokawa, H. Takizawa, M. Ichiki and R. Maeda, Low-temperature growth of high-quality lead zirconate titanate thin films by 28GHz microwave irradiation, Applied Physics Lettres, 86-21 (2005), 212903.
S. H. C. Park, Y. S. Sato, H. Kokawa, K. Okamoto, S. Hirano and M. Inagaki: Corrosion properties in friction stir welded 304 austenitic stainless steel, Welding in the World, 49-3/4 (2005), 63-68.
H. Kokawa, S. H. C. Park, Y. S. Sato, K. Okamoto, S. Hirano and M. Inagaki: Microstructures in friction stir welded 304 austenitic stainless steel, Welding in the World, 49-3/4 (2005), 34-40.
R. Ishibashi, T. Horiuchi, J. Kuniya, M. Yamamoto, S. Tsurekawa, H. Kokawa, T. Watanabe and T. Shoji: Effects of Grain Boundary Character Distribution on Stress Corrosion Cracking Behavior in Austenitic Stainless Steels, Materials Science Forum, 475-479/1-5 (2005), 3863-3866.
H. Kokawa: Weld decay-resistant austenitic stainless steel by grain boundary engineering, Journal of Materials Science, 40-4 (2005), 927-932.
Y. S. Sato, S. H. C. Park, A. Matsunaga, A. Honda and H. Kokawa: Novel production for highly formable Mg alloy plate, Journal of Materials Science, 40 (2005), 637-642.
Z. J. Wang, H. Kokawa, R. Maeda: In situ growth of lead zirconate titanate thin films by hybrid process: sol-gel method and pulsed-laser deposition, Acta Materialia, 53-3 (2005) 593-600.
A. Fuji, K. Ikeuchi, Y. S. Sato and H. Kokawa: Interlayer growth at interfaces of Ti/Al-1%Mn, Ti/Al-4.6%Mg and Ti/pure Al friction weld joints by post-weld heat treatment, Science and Technology of Welding and Joining, 9-6 (2004), 507-512.
Z. J. Wang, Y. Aoki, H. Kokawa, M. Ichiki and R. Maeda: Effect of Zr/Ti Ratio on Microstructure and Electrical Properties of Lead Zirconate Titanate Thin Films Derived by Pulsed Laser Deposition, Journal of Electroceramics,13-(1-3) (2004), 41-45.
Sen Yang, Zhan-Jie Wang and Hiroyuki Kokawa: Optimization of GBCD by Combining Laser Surface Melting with Annealing Heat Treatment, Proceedings of SPIE, 5th International Symposium on Laser Precision Microfabrication, The International Society of Optical Engineering, Vol.5662 (2004), 349-354.
Zhan Jie. Wang, Hiroyuki Kokawa, Ryutaro Maeda and Masaaki Ichiki: Electrical Properties and Microstructure of Lead Zirconate Titanate Thin Film In Situ Grown by Hybrid Processing: Sol-Gel Method and Pulsed Laser Deposition, Japanese Journal of Applied Physics, Part 1, 43-9B (2004), 6554-6557.
Zhan Jie Wang, Hiroyuki Kokawa and Ryutaro Maeda: Electrical properties and microstructure of leadzirconate titanate (PZT) thin films deposited by pulse-laser deposition, Ceramics International, 30-7 (2004), 1529-1533.
S. Yang, N. Chen, W. J. Liu, M. L. Zhong, Z. J. Wang and H. Kokawa: Fabrication of nicke composite coatings reinforced with TiC particles by laser cladding, Surface and Coatings Technology, 183/2-3 (2004), 254-260.
Hiroyuki Kokawa, Seung Hwan C. Park, Yutaka S. Sato, Kazutaka Okamoto, Satoshi Hirano and Masahisa Inagaki: Microstructural Evolution of 304 Austenitic Stainless Steel during Friction Stir Welding, Proceedings of Friction Stir Welding Symposium at The 14th International Society of Offshore and Polar Engineers (ISOPE 2004), Toulon, France, May 23-28, Vol. IV, 2004, 73-77.
Zhan Jie Wang, Yuki Aoki, Li Jun Yan, Hiroyuki Kokawa and Ryutaro Maeda: Crystal structure and microstructure of lead zirconate titanate (PZT) thin films with various Zr/Ti ratios grown by hybrid processing, Journal of Crystal Growth, 267/1-2 (2004), 92-99.
S. H. C. Park, Y. S. Sato, H. Kokawa, K. Okamoto, S. Hirano and M. Inagaki: Corrosion resistance of friction stir welded 304 stainless steel, Scripta Materialia, 51-2 (2004), 101-105.
Yutaka S. Sato, Seung Hwan C. Park, Masato Michiuchi and Hiroyuki Kokawa: Constitutional liquation during dissimilar friction stir welding of Al and Mg alloys, Scripta Materialia,50-9 (2004), 1233-1236.
Wei Dong, Hiroyuki Kokawa, Susumu Tsukamoto, Yutaka S. Sato and Makoto Ogawa: Mechanism Governing Nitrogen Absorption by Steel Weld Metal during Laser Welding, Metallurgical and Materials Transactions B, 35B-2 (2004), 331-338.
Yutaka S. Sato, Yusuke Sugiura, Yohei Shoji, Seung Hwan C. Park, Hiroyuki Kokawa and Keisuke Ikeda: Post-weld formability of friction stir welded Al alloy 5052, Materials Science and Engineering A, 369/1-2 (2004), 138-143.
Hiroyuki Kokawa, Masayuki Shimada, Zhan Jie Wang, Yutaka S. Sato and Masato Michiuchi: Grain Boundary Engineering for Intergranular Corrosion Resistant Austenitic Stainless Steel, Key Engineering Materials, 261-263 (2004), 1005-1010.
Zhan Jie Wang, Hiroyuki Kokawa and Ryutaro Maeda: Growth of Lead Zirconate Titanate Thin Films by Hybrid Processing: Sol-Gel Method and Pulsed-Laser Deposition, Journal of Crystal Growth, 262/1-4 (2004), 359-364.
Z. J. Wang, H. Y. Bi, H. Kokawa, L. Zhang, J. Tsaur, M. Ichiki and R. Maeda: Preparation and characterization of PZT thin films deposited by pulsed laser deposition on template layer, Journal of the European Ceramic Society, 24-6 (2004), 1629-1632.
Yutaka S. Sato, Fumie Yamashita, Yusuke Sugiura, Seung Hwan C. Park and Hiroyuki Kokawa: FIB-assisted TEM study of an oxide array in the root of a friction stir welded aluminium alloy, Scripta Materialia, 50-3 (2004), 365-369.
Y. S. Sato, Y. Kurihara, S. H. C. Park, H. Kokawa and N. Tsuji: Friction stir welding of ultrafine grained Al alloy 1100 produced by accumulative roll-bonding, Scripta Materialia, 50-1 (2004), 57-60.
Seung Hwan C. Park, Yutaka S. Sato, Hiroyuki Kokawa, Kazutaka Okamoto, Satoshi Hirano and Masahisa Inagaki: Rapid formation of the sigma phase in 304 stainless steel during friction stir welding, Scripta Materialia, 49-12 (2003), 1175-1180.
Seung Hwan C. Park, Yutaka S. Sato, Hiroyuki Kokawa: Microstructural evolution and its effect on Hall-Petch relationship in friction stir welding of thixomolded Mg alloy AZ91D, Journal of Materials Science, 38-21 (2003), 4379-4383.
Zhan Jie Wang, Li Jun Yan, Yuki Aoki, Hiroyuki Kokawa and Ryutaro Maeda: Preparation and Characterization of Lead Zirconate Titanate Thin Films Derived by Hybrid Processing: Sol-Gel Method and Pulsed Laser Deposition, Japanese Journal of Applied Physics, Part 1, 42-9B (2003), 5936-5940.
Yutaka S. Sato, Mitsunori Urata, Hiroyuki Kokawa and Keisuke Ikeda: Effect of Friction Stirring on Microstructure in Equal Channel Angular Pressed Aluminum Alloys, Materials Science Forum, 426-432 (2003), 2947-2952.
Hong Yun Bi, Hiroyuki Kokawa, Zhan Jie Wang, Masayuki Shimada and Yutaka S. Sato: Suppression of chromium depletion by grain boundary structural change during twin-induced grain boundary engineering of 304 stainless steel, Scripta Materialia, 49-3 (2003), 219-223.
Seung Hwan C. Park, Yutaka S. Sato and Hiroyuki Kokawa: Effect of micro-texture on fracture location in friction stir weld of Mg alloy AZ61 during tensile test, Scripta Materialia, 49-2 (2003), 161-166.
Yutaka S. Sato, Mitsunori Urata, Hiroyuki Kokawa and Keisuke Ikeda: Hall-Petch relationship in friction stir welds of equal channel angular pressed aluminium alloys, Materials Science and Engineering A, 354/1-2 (2003), 298-305.
Seung Hwan C. Park, Yutaka S. Sato and Hiroyuki Kokawa: Basal Plane Texture and Flow Pattern in Friction Stir Weld of a Magnesium Alloy, Metallurgical and Materials Transactions A, 34A-4 (2003), 987-994.
Seung Hwan C. Park, Yutaka S. Sato, Hiroyuki Kokawa and Tadayoshi Tsukeda: Improvement of Mechanical Properties in Thixomolded Mg alloy AZ91D by Friction Stir Welding, Proceedings of the 6th International Conference on Trends in Welding Research, Georgia, USA, Edited by S. A. David, T. DebRoy, J. C. Lippold, H. B. Smartt and J. M. Vitek, ASM International, (2003), pp.267-272.
Yutaka S. Sato, Mitsunori Urata, Hiroyuki Kokawa and Keisuke Ikeda: Reproduction of Ultra-Fine Grains in Equal Channel Angular Pressed Al alloy 5083 by Friction Stir Process, Proceedings of the 6th International Conference on Trends in Welding Research, Georgia, USA, Edited by S. A. David, T. DebRoy, J. C. Lippold, H. B. Smartt and J. M. Vitek, ASM International, (2003), pp.262-266.
Masayuki Shimada, Hiroyuki Kokawa, Zhan Jie Wang and Yutaka S. Sato: Effect of Twin-induced Grain Boundary Engineering on Intergranular Corrosion in Austenitic Stainless Steel, Proceedings of the 6th International Conference on Trends in Welding Research, Georgia, USA, Edited by S. A. David, T. DebRoy, J. C. Lippold, H. B. Smartt and J. M. Vitek, ASM International, (2003), pp.93-98.
Wei Dong, Hiroyuki Kokawa, Yutaka S. Sato and Susumu Tsukamoto: Nitrogen Absorption by Iron and Stainless Steels during CO₂ Laser Welding, Metallurgical and Materials Transactions B, 34B-1 (2003), 75-82.
Zhan-Jie Wang, Isao Karibe, Hiroyuki Kokawa and Ryutaro Maeda: Microstructure and Electrical Properties of PZT Thin Films Deposited by Laser Ablation on Template Layer, Integrated Ferroelectrics, 46 (2002), 187-195.
Zhan-Jie Wang, Isao Karibe, Ryutaro Maeda and Hiroyuki Kokawa: Preparation of Lead Zirconate Titanate Thin Films Derived by Hybrid Processing: Sol-Gel Method and Laser Ablation, Journal of the American Ceramic Society, 85-12 (2002), 3108-3110.
Zhan Jie Wnag, Ryutaro Maeda and Hiroyuki Kokawa: Deposition of Pb(Zr_XTi_X-1)O₃ thin films by pulsed laser ablation for MEMS application, Proceedings of SPIE on Smart Materials II, The International Society of Optical Engineering, Vol.4934 (2002), 356-363.
Zhan-Jie Wang, Isao Karibe, Hiroyuki Kokawa and Ryutaro Maeda: Effect of Zr/Ti Ratio in Targets on Electrical Properties of Lead Zirconate Titanate Thin Films Derived by Pulsed Laser Deposition on Template Layer, Japanese Journal of Applied Physics, Part 1, 41-11B (2002), 6658-6663.
Hiroyuki Kokawa, Masayuki Shimada, Zhan Jie Wang and Yutaka S. Sato: Intergranular Corrosion-Resistant Stainless Steel by Twin-Induced Grain Boundary Engineering, Annales de Chimie, Science des Materaix, 27, Suppl.1, (2002), S315-S325.
Seung Hwan C. Park, Masato Michiuchi, Yutaka S. Sato and Hiroyuki Kokawa: Dissimilar Friction-Stir Welding of Al Alloy 1050 and Mg Alloy AZ31, Proceedings of International Welding/Joining Conference-Korea 2002 on Intelligent Technology in Welding and Joining for the 21st Century, Gyeongju, Korea, (2002), 534-538.
Yutaka S. Sato, Mitsunori Urata, Takayasu Kaneko and Hiroyuki Kokawa: Effect of Microstructure on Mechanical Properties in Friction Stir Welded Cast A356 Aluminum Alloy, Proceedings of International Welding/Joining Conference-Korea 2002 on Intelligent Technology in Welding and Joining for the 21st Century, Gyeongju, Korea, (2002), 493-498.
Hiroyuki Kokawa, Masayuki Shimada, Zhan Jie Wang and Yutaka S. Sato: Intergranular Corrosion-Resistant Stainless Steel by Grain Boundary Engineering, Proceedings of International Welding/Joining Conference-Korea 2002 on Intelligent Technology in Welding and Joining for the 21st Century, Gyeongju, Korea, (2002), 250-254.
Yutaka S. Sato, Mitsunori Urata, Hiroyuki Kokawa and Keisuke Ikeda: Recovery retardation in equal channel angular pressed Al-Zr alloy during friction stir welding, Scripta Materialia, 47-12 (2002), 869-873.
Zhan Jie Wang, Jia Ru Chu, Ryutaro Maeda and Hiroyuki Kokawa: Effect of Bottom Electrodes on Microstructures and Electrical Properties of Sol-gel Derived Pb(Zr0.53 Ti0.47)O3 Thin Films, Thin Solid Films, 416 (1-2), (2002), 66-71.
Hiroyuki Kokawa, Masayuki Shimada, Zhan Jie Wang and Yutaka S. Sato: Production of Intergranular Corrosion-Resistant Stainless Steel by Twin-Induced Grain Boundary Engineering, Proceedings of the 7th Inter-University Research Seminar on Materials Science, Welding, Joining and Allied Processes, Bratislava, Slovakia, Edited by P. Orszagh, ATP Technika, (2002), 5-11.
Xiaohui Gai, Yutaka S. Sato, Hiroyuki Kokawa and Kazutoshi Ichikawa: Ductile-brittle Transition of Steel Electron Beam Weld Metal in Small Punch Test, Science and Technology of Welding and Joining, 7-4 (2002), 204-211.
Yutaka S. Sato, Mitsunori Urata, and Hiroyuki Kokawa: Parameters Controlling Microstructure and Hardness during Friction Stir Welding of Precipitation-Hardenable Aluminum Alloy 6063, Metallurgical and Materials Transactions A, (2002), 33A-3 (2002), 625-635.
Yutaka S. Sato, Mitsunori Urata, Hiroyuki Kokawa and Keisuke Ikeda: Recovery Retardation in Equal Channel Angular Pressed Al-Zr Alloy during Friction Stir Welding, Scripta Materialia, 47-12 (2002), 869-873.
Masayuki Shimada, Hiroyuki Kokawa, Zhan Jie Wang, Yutaka S. Sato and Isao Karibe: Optimization of Grain Boundary Character Distribution for Intergranular Corrosion Resistant 304 Stainless Steel by Twin-Induced Grain Boundary Engineering, Acta Materialia, 50-9 (2002), 2331-2341.
Yutaka S. Sato, Seung Hwan C. Park and Hiroyuki Kokawa: Microstructural Factors Governing Hardness in Friction-Stir-Welds of Solid-Solution-Hardened Al Alloys, Metallurgical and Materials Transactions A, 32A-12(2001), 3033-3042.
Yutaka S. Sato and Hiroyuki Kokawa: Distribution of Tensile Property and Microstructure in Friction Stir Weld of 6063 Aluminum, Metallurgical and Materials Transactions A, 32A-12(2001), 3023-3031.
Y.S. Sato, M. Urata, H. Kokawa, K. Ikeda, and M. Enomoto: Retention of fine grained microstructure of equal channel angular pressed aluminum alloy 1050 by friction stir welding, Scripta Materialia, 45-1 (2001), 109-114.
Y.S. Sato, H. Kokawa, K. Ikeda, M. Enomoto, S. Jogan, and T. Hashimoto: Microtexture in the Friction-Stir Weld of an Aluminum Alloy, Metallurgical and Materials Transactions A, 32A-4 (2001), 941-948.
A. Fuji, K. Ameyama, H. Kokawa, Y. Satoh and T. H. North: Properties of as welded and heat treated pure titanium-7075 Al-Zn-Mg alloy friction weld joint, Science and Technology of Welding and Joining, 6-1(2001), 23-30.
H. Kokawa, T. Koyanagawa, M. Shimada, Y. S. Sato and T. Kuwana: Dependence of Carbide Precipitation on Grain Boundary Structure in Sensitized Austenitic Stainless Steel, Properties of Complex Inorganic Solids 2, ed. by A. Meike et al., Kluwer Academic/Plenum Publishers, New York, (2000), 17-26.
H. Kokawa, M. Shimada and Y. S. Sato: Grain-Boundary Structure and Precipitation in Sensitized Austenitic Stainless Steel, JOM(Journal of The Minerals, Metals & Materials Society), 52-7 (2000), 34-37.
Y. Sato, W. Dong, H. Kokawa and T. Kuwana: Nitrogen Absorption by Iron and Stainless Steels during YAG Laser Welding, ISIJ International, 40(2000), Supplement, S20-S24.
Y. S. Sato, H. Kokawa, M. Enomoto, S. Jogan and T. Hashimoto: Precipitation Sequence in Friction Stir Weld of 6063 Aluminum during Aging, Metallurgical and Materials Transactions A, 30A-12(1999), 3125-3130.
Y. S. Sato, H. Kokawa, M. Enomoto and S. Jogan: Micristructural Evolution of 6063 Aluminum during Friction-Stir Welding, Metallurgical and Materials Transactions A, 30A-9(1999), 2429-2437.
Y. S. Sato, H. Kokawa and T. Kuwana: Effect of Nitrogen on Sigma Transformation in Duplex Stainless Steel Weld Metal at High Temperatures, Proc. 5th Intern. Conf. on Trands in Welding Research, Georgia, USA, Edited by J. M. Vitek, S. A. David, J. A. Johnson, H. B. Smartt, T. DebRoy, ASM International, (1999), pp. 131-136.
H. Kokawa, Y. S. Sato, A. Ishida, T. Arakawa, and K. Hirano: Effects of Magnetic Stirring and Grain Structure on Ultrasonic Characteristics in Inconel Overlay-Welds, Proc. 5th Intern. Conf. on Trands in Welding Research, Georgia, USA, Edited by J. M. Vitek, S. A. David, J. A. Johnson, H. B. Smartt, T. DebRoy, ASM International, (1999), pp. 67-71.
Y. S. Sato and H. Kokawa: Preferential Precipitation Site of Sigma Phase in Duplex Stainless Steel Weld Metal, Scripta Materialia, 40-6(1999), 659-663.
Y. S. Sato, H. Kokawa and T. Kuwana: Effect of Nitrogen on Transformation in Duplex Stainless Steel Weld Metal, Science and Technology of Welding and Joining, 4-1(1999), 41-49.
H. Matsunaga, Y. S. Sato, H. Kokawa and T. Kuwana: Effect of Nitrogen on Corrosion of Duplex Stainless Steel Weld Metal, Science and Technology of Welding and Joining, 3-5(1998), 225-232.
T. Kuwana, H. Kokawa and M. Saotome: Quantitative Prediction of Nitrogen Absorption by Steel During Gas Tungsten Arc Welding, Mathematical Modelling of Weld Phenomena 3, ed.by H. Cerjak, The Institute of Materials, London, (1997), 64-81.
H. Kokawa, E. Nagashima, T. Kuwana, I. Aoshima and K. Arato: Diffusion bonding of Ti-6Al-4V alloy using superplastic titanium alloy insert material, Science and Technology of Welding and Joining, 1-1(1996), 29- 35.
H. Kokawa, E. Tsory and T. H. North: Nitride Precipitation in Duplex Stainless Steel Weld Metal, ISIJ International, 35-10(1995),1277-1283.
H. Kokawa, T. Tsuzuki and T. Kuwana: Effect of Initial Microstructure of Intermediate Material on Superplastic Diffusion Bonding of Duplex Stainless Steel, ISIJ International, 35-10(1995), 1291-1297.
H. Kokawa and T. Kuwana: Relationship between Grain Boundary Structure and Intergranular Corrosion in Heat-Affected Zone of Type 304 Stainless Steel Weldments, Transactions of the Japan Welding Society, 23-2(1992), 73-81.
K. Ikeuchi, Y. Zhou, H. Kokawa and T. H. North: Liquid-Solid Interface Migration at Grain Boundary Regions during Transient Liquid Phase Brazing, Metallurgical Transactions A, 23A-10(1992), 2905-2915.
H. Kokawa, C. H. Lee and T. H. North: Effect of Grain Boundaries on Isothermal Solidification during Transient Liquid Phase Brazing, Metallurgical Transactions A, 22A-7(1991), 1627-1631.
H. Nakagawa, C. H. Lee, H. Kokawa and T. H. North: Hochtemperaturloeten von Nickel ueber temporaere diffusionsgesteuerte Fluessigphasen, Schweissen und Schneiden, 43-7(1991), 380-383.
H. Kokawa, T. Kuwana and A. Yamamoto: Crystallographic Characteristics of Delta-Ferrite Transformations in a 304L Weld Metal at Elevated Temperatures, Welding Journal, 68-3(1989), 92s-101s.
H. Kokawa, T. Watanabe and S. Karashima: Reexamination of Deviation Angles from Exact CSL Misorientations in Early Work on Grain Boundary Characterization, Scripta Metallurgica, 21-6(1987), 839-842.
H. Kokawa, T. Watanabe and S. Karashima: Structural Changes during Sliding of Aluminium Grain Boundaries with Different Initial Structures, Scripta Metallurgica, 17-10(1983),1155-1159.
H. Kokawa, T. Watanabe and S. Karashima: Dissociation of Lattice Dislocations in Coincidence Boundaries, Journal of Materials Science, 18- 4(1983), 1183-1194.
H. Kokawa, T. Watanabe and S. Karashima: Sliding Behaviour and Dislocation Structures in Aluminium Grain Boundaries, Philosophical Magazine A, 44-6(1981), 1239-1254.
H. Kokawa, T. Watanabe, A. Uehara and S. Karashima: Observations of Grain Boundary Fine Structures in Zinc by Transmission Electron Microscopy, Scripta Metallurgica, 12-4(1978), 357-359.

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