Influences of Ni content on Thermo-Mechanical Properties of Ti-Ni Shape Memory Alloy by Spark-Plasma Sintering

Ti-Ni shape memory alloy (SMA) was fabricated by the spark-plasma sintering method using elemental powders. The sintering and heat-treatment conditions were investigated to fabricate superior SMA by this method. Also, the influence of Ni content on the thermo-mechanical properties was investigated. The density of the compact sintered at 1153K was the highest, and the relative density was 96.6%. The sintered compact improved greatly in mechanical properties and thermo-mechanical properties by the heat treatment. The more the Ni content, the higher the deformation resistance and the recovery stress. The solution-treated compact was more than 400 MPa in tensile strength and more than 5.5% in elongation at any Ni content, and the solution treated Ti-51.0at%Ni compact was 320 MPa in recovery stress.