在实验基础上研究了Ti_(50)Ni_(50),Ti_(50)Ni_(45)Cu_2)和Ti_(50)Ni_(45)Cu_5的可逆形状记忆效应,得到可逆应变能U_r与温度的经验关系: U_r=U_0[1-exp(-mT_R~N)] 式中,n是形状一温度敏感指数,m是与材料特性有关的常数.移植Johnson-Mehl-Avrami描述相变-时间关系的唯象方法,得到与可逆形状记忆效应相伴随的热弹性马氏体相变与温度的半定量关系,且与上述经验关系对应.
Based on study of the recoverable shape memory effect (SME) of shape memory alloys Ti_(50_Ni_(50), Ti_(50)Ni_(48)Cu_2 and Ti_(50)Ni_(45)Cu_5 by experiment, an empirical relationship between recoverable strain energy, U_r, and temperature, T, was derived as: U_r=U_0[1-exp(-mT_R~n)]where m-characteristic constant related to material, and n-shape-temperature sensitivity. This empirical expression will be correspondent with that of semiquantitative relationship between thermoelastic martensite transformation and temperature, associated with recoverable SME, if the Johnson-Mehl-Avrami's phenomenological method to a description of time dependence of phase transformation is adopted.
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