The effects of indium addition on mechanical properties and shape memory behavior of Ti-Ta-Zr high temperature alloys

Abstract

The effects of indium on the microstructure, transformation temperature, mechanical properties, and shape memory effect of (Ti83Ta17)85−xZr15Inx alloys were investigated. The results showed that (Ti83Ta17)85−xZr15Inx (x = 1, 3, 5)(at%) alloys were all composed of orthorhombic α"-martensitic phase. The reverse martensitic transformation starting temperature (As) was 346 °C for x = 1 and increased with increasing indium content. The Young's modulus firstly decrease then increase with the addition of Indium. When the Indium content is 1 at%, the lowest strength and the largest elongation 25.8% can be obtained. The minor addition of indium can make up for the deficiency of low plasticity and retained a relatively large shape memory recovery strain. A prefect recovery strain of 4% were obtained in all (Ti83Ta17)85−xZr15Inx alloys.