The effects of shape memory treatment temperature, Ni content, maximum strain and testing temperature on superelasticity characteristics and fatigue property in Ti-Ni shape memory alloy wires were investigated. The isothermal cyclic tensile tests were carried out. The results show that the residual martensitic volume fraction represents the changes in the critical stress for inducing martensite with number of cycles, maximum strain, testing temperature, shape memory treatment temperature and Ni content. Increase in residual strain against the residual martensite volume fraction becomes larger as shape memory treatment temperature increases. However, these changes are insensitive to maximum strain, testing temperature and Ni content. In the fatigue property, it was effective that the Ni content was few and shape memory treatment temperature was 723K or more.
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