论文部分内容阅读
研究了氢对一种Ｔｉ３Ａｌ基合金（Ｔｉ２４Ａｌ１４Ｎｂ３Ｖ０．５Ｍｏ，ａｔ％）组织和高温变形的影响。结果表明：渗氢使所研究合金的Ｏ相中形成了氢化物，这些氢化物在高温下分解，留下了一些位错线。渗氢还使Ｏ相的体积分数下降。在高温变形中，氢的存在可促进Ｏ相的动态再结晶和Ｂ２相中的位错运动，并能降低变形过程激活能。同时，对氢降低合金高温变形的流变应力的机制进行了分析。
The effect of hydrogen on microstructure and high temperature deformation of a Ti3Al-based alloy (Ti24Al14Nb3V0.5Mo, at%) was investigated. The results show that hydrogen infiltration hydrogenates the O phase of the alloy under study, and these hydrides decompose at high temperature, leaving some dislocation lines. Hydrogen permeation also decreases the volume fraction of O phase. In high temperature deformation, the presence of hydrogen can promote the dynamic recrystallization of O phase and dislocation movement in B2 phase, and can reduce the activation energy of deformation process. At the same time, the mechanism of hydro-stress in reducing high-temperature deformation of hydrogen alloy was analyzed.