氢对Ti3Al—Nb合金组织和高温变形的影响

Effect of Hydrogen on the Microstructure and High Temperature Deformation of a Ti3Al Nb Alloy

摘要:

研究了氢对一种Ｔｉ３Ａｌ基合金（Ｔｉ－２４Ａｌ－１４Ｎｂ－３Ｖ－０．５Ｍｏ．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相中氢化物，这些氧化物在高温下分解，留下一些位错误，渗氮还使Ｏ相的体积发散下降，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国的机制进行了分析。

Abstract:

The effect of hydrogen on the microstructure and high temperature deformation of a Ti3Al based alloy (Ti 24Al 14Nb 3V 0.5Mo(at%) has been studied. The results show that the hydrides as a result of form hydrogenation decompose at high temperatures, introducing some dislocations. The volumn fraction of the O phase decreases due to the addition of hydrogen. Under high temperature deformation, the hydrogen facilitates the dynamic recrystallization of the O phase and dislocation movement in the B2 phase. The activation energy is also reduced. The mechanisms of hydrogen reduced flow stress and increased m value at high temperature deformation are also analyzed in detail.