Cu－Zn－Al合金贝氏体的三个生长阶段及其精细结构研究

Three Growth Stages and Fine Structures of Bainite in a Cu-Zn-Al Alloy

利用透射镜研究了Ｃｕ－Ｚｎ－Ａｌ合金贝氏体ａ＿１相在相变过程中的精细结构变化，发现贝氏体的生长经历三个阶段：初生态、中间态和退化态。初生贝氏体内不含层错亚结构，ａ＿１依台阶机制长大到一定程度后，内部出现层错；随转变进一步进行，ａ＿１内的层错结构逐渐消失，发生“过退火”，最终向平衡相转变。

The change of fine structures of bainite a_1 in a Cu-Zn-Al alloy was investigated by TEM。It was discoveredthat bainite undergoes three stages during its growth :initial ,intermediate and degenerate stages。The initial a_1plate is free of stacking faults。The faults appear after the plate grows to a certain extent. They will vanishgradually as the transformation progresses and finally, a_1 transforms to equilibrium a phase。