【摘要】 本文研究了TiNi形状记忆合金丝在恒应力约束降温过程中所形成的马氏体的逆相变开始温度As以及可恢复应变率。结果表明:随着约束应力的增加,样品的As上升,可恢复应变率下降。与之相比,随预应变的增加,室温预应变TiNi样品所形成马氏体的As以及可恢复应变率也表现出相似的趋势,但是,当预应变值相同时,恒应力约束降温预应变样品的As以及可恢复应变率都低于室温预应变样品。更多还原

【Abstract】 The reverse transformation temperature and recovery strain ratio of the martensite formed during the cooling process under a constant stress in TiNi shape memory alloy wires are studied in this paper. Results show that a higher level of the applied constant stress during the cooling process will induce martensite with a higher reverse martensitic transformation start temperature As and a smaller recovery strain ratio. Similarly, a prestrain at the room temperature elevates the As temperature and decreases the recovery strain ratio. However, the As temperature and the recovery strain ratio of the martensite formed during the cooling process under a constant stress are lower than those of the martensite formed by prestrain at the room temperature.更多还原