TiAl基合金双态组织试样室温断裂的研究  

INVESTIGATION ON THE FRACTURE CHARACTERISTIC OF TiAl BASED ALLOY WIT DUPLEX MICROSTRUCTURE AT ATMOSPHERE TEMPERATURE

作　　者：贺跃辉[1] 黄伯云[1] 曲选辉[1] 刘文胜[1] 陈小群[1] 

机构地区：[1]中南工业大学粉末冶金研究所

出　　处：《中南工业大学学报》1997年第1期40-43,共4页Journal of Central South University of Technology(Natural Science)

基　　金：国家自然科学基金;国家"八六三"高技术计划基金

摘　　要：采用预制缺口试样，测试了Ｔｉ－３３％Ａｌ－３％Ｃｒ－０．５％Ｍｏ（质量分数）合金双态组织材料的室温ＫＩＣ值．使用扫描电子显微镜，研究了薄板状试样内裂纹扩展动态过程；并采用透射电子显微镜，进一步研究了薄膜试样内裂纹扩展动态过程，以及裂纹尖端附近区域上的变形亚结构．试验结果表明，ＴｉＡｌ基合金双态组织试样表现出低的室温断裂韧性，归因于γ相晶粒内容易形成剪切带，造成了γ相晶粒对裂纹扩展表现出低的阻力．The K IC value of Ti 33%Al 3%Cr 0 5%Mo alloy sample with duplex microstructure at atmosphere temperature was measured. The crack growth process of thin plate sample at tensile stress was observated kineticly using SEM. And the crack expansion and the substructure around the crack tip were investigated on TEM. The test results show that the low fracture toughness of the sample with duplex microstructure is due to the formation easy of shearing tear crack at gamma grains, which expressed that the hinder force of gamma phase gains to the crack growth was small.

关 键 词：TIAL 金属间化合物 双态组织 室温 断裂韧性 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG111.91[金属学及工艺—金属材料]