Effect of Rare Earth Y on Microstructure and Superelasticity of Ti-Ni-Cu Memory Alloy [稀土 Y 对 Ti-Ni-Cu 记忆合金组织与超弹性的影响]

作者：Zhao G.-W.^*; Li D.; Xu G.-X.; Fang D.; Huang C.-H.; Ye Y.-S.; Shi Z.-M.

来源：Foundry, 2022, 71(8): 956-961.

• cyclic compression
• shape memory alloy
• superelasticity
• Ti-Ni-Cu-Y

Ti-Ni-Cu-Y as cast memory alloys were prepared by vacuum arc melting. The effects of rare earth Y on the microstructure and properties of the Ti-44Ni-6Cu memory alloy were investigated by SEM and cyclic compression. The results showed that Y-Cu and Y-rich compounds gradually increased and the grain size became larger with the increase of the Y element. In a certain composition range, the addition of the Y element enhanced the mechanical properties of the Ti-44Ni-6Cu alloy. The compression strength of the 0.6Y alloy reached 3 223 MPa, the fracture strain of the 1.0Y alloy reached 46.5%, and the martensitic yield strength of the 2.0Y alloy increased by 34%. The addition of the Y element also improved the recoverable strain and superelasticity of the Ti-44Ni-6Cu alloy. The recoverable strain and superelasticity strain of the 2.0Y alloy reached 4.95% and 2.75%, respectively, which were 1.87 and 4.59 times higher than those of the 0Y alloy. After 20 times cyclic compression with 7% pre-strain, the 2.0Y alloy almost completely recovered, the superelasticity and shape memory properties tended to be stable.

• 单位
  三峡大学