Alloy Design and Development of Advanced Materials Based on Phase Diagrams and Microstructural Control

Abstract

Recent progress in the development of advanced materials based on the study of CALPHAD approach to the phase diagrams and microstructural control is presented. Thermodynamic databases on the FeS based system, FeMnAl based alloys, Cu-based alloys and Cobased superalloys have been constructed. By utilizing these databases and information on phase diagrams, the following advanced materials have been designed and developed; (i) Schaeffler-type Ti-based alloys, (ii) Pb-free machinable stainless steels using titanium carbosulphide, (iii) high strength FeMn based alloys with low density, (iv) FSW (Friction Stir Welding) tool using Co-based superalloy strengthened by £ A (Co 3 (Al, W)) phase, (v) Ni based metamagnetic shape memory alloys, (vi) CuNiAl based alloys with high strength and high electronic conductivity strengthened by £ A (Ni 3 Al) phase, and (vii) Ingrown nail correcting device and seismic application using CuAlMn based shape memory alloys. The alloy design and practical application of these materials focussing on the use of phase diagrams have been presented.