Cu-Zn-Al合金的X射线和电子显微术的研究

来源期刊：中南大学学报(自然科学版)1983年第2期

论文作者：孔祥炎 高安娟

文章页码：49 - 54

关键词：电子显微术； 马氏体转变； 合金成分； 形状记忆合金； 电子衍射花样； 反相畴界； 畴结构； 马氏体合金； 电子浓度； 超结构

摘    要：本文利用X射线衍射和透射电子显微术研究了电子浓度为1.44—1.46之间的四种Cu-Zn-Al形状记忆合金。X射线衍射和迭区电子衍射花样证明,四种合金的母相（β₁）均为DO₃有序结构,马氏体相（β’₁）为M18R结构。本工作发现超结构衍射斑点在确定方向上分裂成等间距的点列,和超结构反射暗场象的反相畴界,表明Cu-Zn-Al马氏体合金具有相畴结构。反相畴界作为一种晶体缺陷影响马氏体中层错区域的连续延伸。

Abstract: The phase structures of four Cu-Zn-Al shape memory alloys with e/a rang-ing from 1.44 to 1.46 have been investigated using X-ray diffraction andtransmission electron microscopy. The analyses of both X-ray and electrondiffraction patterns indicate that β₁ parent phase has DO₃ order structure andthat β₁ martensite has M18R structure for each alloy. It is found that allsuperlattice spots split into spot arrays of equal spacing in a certain direc-tion and an antiphase domain boundary exists in the DF image of superlat-tice reflection, indicating that Cu-Zn-Al martensite alloys exist in phasedomain structure. As a crystal deflect, the antiphase domain boundary willinfluence the continuous extension of fault area in the β₁′ martensite.