Heat Treatment Conditions to Fabricate Ti-Ni Shape Memory Alloy by Laminate Method

Abstract

The purpose of this study is to investigate the heat treatment conditions to fabricate Ti-Ni shape memory alloy by Ti/Ni multilayers. The Ti/Ni multilayers were fabricated by multi-step cold rolling of laminates of Ti and Ni foils. They were heat treated at temperatures between 973K and 1273K. The shape memory characteristics of the samples made by laminate method were measured by X-ray diffraction and differential scanning calorimeter. The Ti/Ni multilayers were alloyed to Ti-Ni at 973 K or higher temperature for 12 h or 24 h. The shape memory characteristics at the room temperature are best for the sample heat treated at 1173 K for 24 h among all studied samples.