单向拉伸中TB5钛合金组织转变的原位观察  

Situ observations of structural transformation in TB5 titanium alloy during one way tensile test

作　　者：柳长旭[1] 吴国清[1] 沙爱学[2] 王清瑞[2] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191 [2]北京航空材料研究院,北京100095

出　　处：《北京航空航天大学学报》2012年第11期1474-1477,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：北京市科技新星计划资助项目(2007B016);教育部长江学者和创新团队发展计划资助项目(IRT0805)

摘　　要：通过单向拉伸下的视频显微镜原位观察,定量研究了Ti-15V-3Cr-3Sn-3Al(即为TB5)钛合金显微组织在拉伸过程中的演变规律.结果表明:单向拉伸时,该钛合金在弹性阶段组织变化不明显,而在塑性阶段随变形量的增加,组织中滑移带的变化可分为单滑移、多滑移和交滑移3个阶段.在单向拉伸过程中,由于滑移带从单滑移进入到多滑移,发生了几何硬化,导致晶粒变化减缓,滑移带的转动幅度变小.Microstructure transformation in Ti-15V-3Cr-3Sn-3AI（TB5） titanium alloy during one way ten- sile test was studied in situ observations of the video microscope. The results show that the change of the mi- erostructure of the titanium alloy in uniaxial tension is not obvious in the elastic stage, but according to the change of the slip bands in the microstructure it can be divided into three stages following with the increase of the deformation in the plastic stage. The three stages are the single slip, the multiple slip and the cross slip. Geometric hardening occurs from the single slip to the multiple slip in uniaxial tension, so the change of the grains slows down and the rotation range of the slip bands is smaller.

关 键 词：钛合金 统计 显微组织 拉伸 滑移带 

分 类 号：TG113.12[金属学及工艺—物理冶金]