2018•Journal of the Japan Society of Powder and Powder MetallurgyOpen access

Effect of Shape Memory Heat Treatment on Microstructures and Mechanical Properties of Powder Metallurgy TiNi Shape Memory Alloy

Ryoichi Soba, Yukiko Tanabe, Takayuki Yonezawa, Junko Umeda, Katsuyoshi Kondoh

Abstract

The shape memory heat treatment effects on the microstructures and the mechanical properties of TiNi shape memory alloys fabricated by powder metallurgy (PM) process were investigated in this study. Through the optimization of the shape memory heat treatment conditions, PM TiNi alloy showed a high plateau stress of 454 MPa and a good shape recovery of 96.4% in 8% strain applied via the heat treatment at 773 K for 10 min. A longtime heat treatment applied to PM TiNi alloys caused an increase of the amount of Ti3Ni4 precipitates in the TiNi matrix, and led to the relative decrease of Ni solid solution in the matrix which resulted in the decrease of the plateau stress.

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Key concepts: Shape-memory alloy, Materials science, Microstructure, Alloy, Metallurgy, Powder metallurgy, Plateau (mathematics), Stress (linguistics)