TiAl基双相合金等温转变的动力学

Kinetics of Isothermal Transformation in Two Phase TiAl-based Alloys

利用定量金相和Ｘ射线衍射的方法研究厂过饱和有序α２相等温转变的动力学。两种方法所测得的γ相析出量与等温处理时间的关系相互吻合。Ｔｉ－４５Ａｌ合金的等温转变速度明显高于Ｔｉ－４２Ａｌ合金。在相图中的共析转变温度以下，转变速度随温度的降低而减小，没有出现Ｃ字形等温转变曲线的可能性。

inetics of isothermal transformation of supersaturated phase of ordered a2 was investagated with method of quantitative metallographic examination and X- ray diffraction. The relationship between the amount of 7 phase precipitation and the isothermal transformation time with the both method is agreed. The rate of isothermal transformation in alloy 45Al is larger remarkably than the one in alloy 42Al. Under the eutectoid temperature in Ti- Al phase diagram the rate of transformation decreases with temperature,ho it is.not able that the isothermal transformation curve becomes the shape of letter C.