Ti-31合金微观结构的TEM研究

用透射电子显微镜（ＴＥＭ）研究了Ｔｉ－３１合金微观结构。结果表明，锻件在８００℃退火缓冷条件下，合金组织存在α、α２、β及富Ｎｉ呈片状的α／β界面相；８００℃退火空冷时，其基本组织为α＋β相和界面相；相成分分析结果还表明，Ｎｉ、Ｍｏ只分布在β相和界面相中，α相中Ａｌ、Ｚｒ含量比β相中的相对高很多，造成α相Ａｌ当量高，可在α相中析出α２相。

Study on Microstructure of Ti-31 Alloy by TEM

The microstructure of Ti 31 alloy is studied by using TEM.The results indicate that for a Ti 31 alloy forging,there are α、α 2、β phases and lamellar interfacial phase of α/β rich in Ni under the condition of annealing at 800℃ followed by slow cooling,and annealing at 800℃ followed by air cooling,its basic microstructure is mainly α+β phases and interfacial phase. Further the results of phase analyses show that Ni and Mo are only distributed in α phase and interfacial phase,and the contents of Al and Zr in phase are much more than these in β phase ,resulting in a high equivalent of Al and precipitation of α 2 phase in α phase.