Cu－Zn－Al合金中贝氏体的有序性

本文用Ｘ射线研究了Ｃｕ－２０Ｚｎ－６Ａｌ（ｗｔ％）合金中贝氏体结构的有序性，并与马氏体结构进行了比较，实验表明，从高温Ｂ２母相和低温Ｌ２１母相生成的贝氏体中（１１５）和（２０５）衍射峰或（１２１０）和（２０１０）衍射峰是重叠的，对生成的贝氏体进行一段时间的保温或缓慢冷却处理，其衍射峰的特征并不改变，这与马氏体（１１５）和（２０５）衍射峰或（１２１０）和（２０１０）衍射峰的分离特性不相符合。说明贝氏体结构有序度与马氏体明显不同，它的形成不可能继承母相的有序度。

Ordering of Bainite in Cu-Zn-Al Alloy

The ordering of bainite is studied and compared with that of martensite in a Cu-20Zn-6Al(wt%) alloy by X-ray analyses. Experimental results show that in contrast with the diffraction pattern for 9R or 18R martensite, (115) peak separating from (205), or (1210) from (2010), the (115) and (205) or the (1210) and (2010) diffraction peaks in the bainites formed from high temperature B2 or low temperature L21 parent phase overlap and these phenomena do not change after prolonged aging or slow-cooling treatment. Thus, this work reveals that the degree of the ordering in bainite structure is quite different from that of the martensite, i.e., the inheritance of the ordering of the parent phase would not occur, associated with the bainite formation.