多晶Cu-Zn-Al合金变形过程中马氏体的精细结构变化

FINE STRUCTURE VARIATION OF POLYCRYSTALLINE Cu-Zn-Al SHAPE MEMORY ALLOY UNDER MARTENSITE DEFORMATION

本文利用透射电子显微镜研究了多晶Cu-Zn-Al形状记忆合金在马氏体状态的变形过程中,其精细结构的变化。结果表明:在变形的初期阶段,变形通过变体的再取向实现,但再取向常有不完全性,而且再取向后,原先变体间的界面依然存在。变形量较大时,马氏体中出现大量的孪晶,孪晶面为(001)。在局部区域出现位错。这时马氏体失去热弹性,记忆效应被破坏。

An investigation has been made of the fine structure variation of thepolycrystalline Cu-Zn-Al shape memory alloy under martensite deformation by meansof TEM observation. Deformation, in the initial stage, is accomplished by thereorientation of variants, but the reorientation is often incomplete. After furtherreorientated, the interfaces among the prior variants still remain. A lot of twinswill appear in martensite under enormous deformation, and the twin plane is (001).The dislocations occur in some regions. In this case, the martensite will lose itsthermoelasticity and the shape memory effect will be damaged.