利用X射线衍射、透射电镜观察等方法研究了Cu-11.9Al-2.5Mn合金的马氏体结构及其在时效过程中的变化.该合金淬火态马氏体为单斜18R结构(M18R),点阵常数为:a=0.4475nm,b=0.5229nm,c=3.815nm,β=89.6°.特点是单斜角β很大,已非常接近正交18R结构(N18R);马氏体内存在两种类型的面缺陷,一种是基面堆垛层错,另一种是非基面堆垛层错;时效时马氏体由单斜向正交转变的过程在一定程度上受到抑制,因而具有较高的抗马氏体稳定化的能力.
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