EFFECTS OF ANNEALING TEMPERATURE AND STRESS-STRAIN CYCLE ON SUPERELASTICITY OF Ti-Ni-Cr SHAPE MEMORY ALLOY
WANG Qi, HE Zhirong, WANG Yongshan, YANG Jun
School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723003
Cite this article:
WANG Qi HE Zhirong WANG Yongshan YANG Jun. EFFECTS OF ANNEALING TEMPERATURE AND STRESS-STRAIN CYCLE ON SUPERELASTICITY OF Ti-Ni-Cr SHAPE MEMORY ALLOY. Acta Metall Sin, 2010, 46(7): 800-804.
Effects of annealing temperature (θan) and stress-strain cycle on superelasticity (SE) of Ti-50.8Ni-0.3Cr alloy were investigated by tensile test. The results show that with increasing θan, critical stress for stress-induced martensite (σM) descends firstly and then rise. The σM reaches its minimum value (311 MPa) and maximum value (583 MPa) when annealing temperature is 450 and 600℃,\linebreak respectively. When θan=350-590℃, the residual strain (εR) has no obvious change, keeps at a low value all the time. When θan>590℃, the εR rises rapidly. With increasing stress-strain cycle number (N), the alloy annealed at 350 and 590℃ transform from incompletely nonlinear superelasticity to completely nonlinear superelasticity. The alloy annealed at 650℃ transform from incompletely superelasticity to linear-like superelasticity. Moreover, with increasing N, the energy dissipation ability of the alloy annealed at 590 and 650℃ descend gradually, and tend to stability. The energy dissipation ability of the alloy annealed at 350℃ nearly keeps constant. In order to get excellent SE, the annealing temperature of Ti-50.8Ni-0.3Cr alloy should be below recrystallization temperature.
Supported by Natural Science Foundation of Shaanxi Province (No.2009JM6010) and Special Scientific Research Program Founded by Shaanxi Provincial Education Department (No.09JK375)
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