一、前言 众所周知,金属的形状记忆效应是由于金属在温度或应力的作用下引起非扩散性原子集团运动,而要满足在变形时原子移动途径相同的逆转变且不引起滑移,位错之类非可逆变化,只有在发生马氏体转变的情况下才能产生,因此形状记忆效应是马氏体相的晶格变化所出现的宏观现象。但并非所有的发生马氏体转变的金属都能出现记忆效应, I. Preface As we all know, metal shape memory effect is due to the metal under the action of temperature or stress caused by non-diffusive atomic group movement, and to meet the deformation in the same way the atomic movement of the reverse transformation and does not cause slip, dislocation The irreversible change of a class can only occur in the case of martensite transformation. Therefore, the shape memory effect is a macroscopic phenomenon that appears in the lattice change of the martensite phase. However, not all of the metals that undergo martensitic transformation can exhibit a memory effect,