Deformation temperature and postdeformation annealing effects on severely deformed TiNi alloy by equal channel angular extrusion

Zhenhua Li and Xianhua Cheng School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200030, China.

摘 要：Micron TiNi alloy blocks were fabricated at high temperature by equal channel angular extrusion （ECAE） using hot-forged Ti-50.3at%Ni alloy as the raw material and the effects of deformation temperature and postdeformation annealing on the severely deformed TiNi alloy by ECAE were investigated. The results show that the TiNi alloy processed by ECAE undergoes severe plastic deformation, and lowering the deformation temperature and increasing the number of extrusions contribute to grain refine- ment. When the annealing temperature is below 873 K, static recovery is the main restoration process; when the temperature rises to 973 K, static recrystallization occurs. It is found that fine particles are precipitated when the TiNi alloy processed by ECAE is an- nealed at 773 K.

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