Characterization of Joule Heat Induced Shape Memory Behavior in Ti-Ni Alloy System Thin Films

Abstract

We have developed a testing machine for evaluating Joule heat induced shape memory behavior in Ti-Ni binary and Ti-Ni-X ternary alloy system thin films prepared by sputtering. The apparatus can apply a constant tensile stress to the specimen and measure the change of the strain of the specimen induced by Joule′s heating. It was confirmed that the films having higher Ms temperature and/or narrower transformation hysteresis showed faster actuation response.