Graduate School of Engineering
Department of Metallurgy

Materials Forming and Structural Control
Computational Microstructure Design (Prof. Kainuma)

Research Topics

Thermodynamic Analysis for Materials

Phase diagram is sometimes referred as "Map for development of advanced materials". One of our missions is to experimentally determine phase diagrams in various alloy or compound systems and to thermodynamically analyze the Gibbs free energy of phases in their systems. Up to now, we have established a lot of thermodynamic databases, such as alloy semiconductors, micro-solder alloys, Fe-based alloys, Cu-based alloys etc.

Development of Eco-materials

Heavy elements, such as Hg, Pb, Cd etc., are considered as an origin of water pollution that affects the health of human. Especially lead included in conventional microsolder alloys is one of the most serious problems because of dissolution and inflow to subterranean water by acid rain from the scraps of electronic products in the open air. We try to develop some promising Pb-free microsolder alloys and Pb-free machinable steels on the basis of the information from the thermodynamic database

Development of Smart Materials

NiTi (Nitinol) alloys which are of the most famous shape memory (SM) alloy system have been already applied in several industrial and medical fields. The low ductility and the non-magnetism of Nitinol, however, restrict to expand the practical field. Recently, we have developed a new kind of SM alloys Cu-Al-Mn with high ductility and SM properties comparable to the Nitinol. Application to the guide wire in the medical catheter is now tried. On the other hand, ferromagnetic SM alloys are also one of our research targets. Up to now, we have developed a lot of new alloy systems including the ferromagnetic SM alloys.

Fig. 1:Microstructure, machinability and corrosion resistance of Pb-free machinable steels developed by our group. Our steels show lower abrasion rate and higher corrosion resistance to 5% NaCl solution than conventional other steels.

Fig. 1:
Microstructure, machinability and corrosion resistance of Pb-free machinable steels developed by our group. Our steels show lower abrasion rate and higher corrosion resistance to 5% NaCl solution than conventional other steels.

Fig. 2:Ferromagnetic shape memory alloys developed by our group.

Fig. 2:
Ferromagnetic shape memory alloys developed by our group.