TiAl基合金层片状晶团热稳定性的研究

A STUDY ON THE THERMOSTABILITY OF LAMELLAR CRYSTALLINE CLUSTERS IN A TiAl-BASED ALLOY

本文研究了退火态全层片状组织和热锻未破碎层片状晶团在（α＋γ）两相区退火过程中等轴化组织转变的动力学特征。使用光学金相显微镜、扫描电子显微镜（ＳＥＭ）和透射电子显微镜（ＴＥＭ）较详细地研究了相变和组织转变特征。结果表明，ＴｉＡｌ基合金中具有完好层片结构的α２／γ层片状晶团在高温加热保温过程中表现出高的显微组织热稳定性。

The dynamic fransformation behaviors of the as-annealed full lamellar structure and the as-hot forged unfragmented lamellar crystalline clusters were investigated during annealing in (α+γ) phase area,and the lorresponding phase and structure transformation characteristics were determined in detail using an optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results showed that the α2/γ lamellar crystalline clusters with sound lamellar structure axhibit a good therostability during high-temperature holding.