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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(β_1)均为DO_3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。
In this paper, four kinds of Cu-Zn-Al shape memory alloys with electron concentration of 1.44-1.46 were studied by X-ray diffraction and transmission electron microscopy. The X-ray diffraction and the diffraction pattern of the zone-by-area electron diffraction prove that the parent phases (β_1) of all four alloys are both DO_3-ordered and the martensite (β’_1) is M18R. In this work, we found that the superfine diffraction spots split into equidistant points in the definite direction and the antiphase boundaries of the super-structure darkfield reflectance show that the Cu-Zn-Al martensitic alloy has the phase domain structure. Inverted boundaries as a kind of crystal defects affect the continuous extension of the staggered regions in the martensite.