氢对Ti_3Al-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

作　　者：杜云蕙 丁桦[1] 宋丹 

机构地区：[1]东北大学

出　　处：《稀有金属材料与工程》1999年第3期136-139,共4页Rare Metal Materials and Engineering

摘　　要：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 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.

关 键 词：氢 TI3AL-NB合金 组织 高温变形 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TG146.23[金属学及工艺—合金]