TiAl基合金双态组织高温变形的研究  

Deformation of duplex Microstructure of TiAl-based Alloy at Elevated Temperature

作　　者：欧文沛[1] 黄伯云[1] 贺跃辉[1] 曲选辉[1] 

机构地区：[1]中南工业大学粉末冶金研究所,长沙410083

出　　处：《材料科学与工艺》1998年第1期8-12,共5页Materials Science and Technology

基　　金："863"高技术资助项目

摘　　要：采用自制的高温拉伸机研究了Ti－33Al—3Cr—0.5Mo合金双态组织的高温变形。结果表明，在适当的变形工艺条件下，在970℃获得了高达194％的延性。研究认为，品界和晶内位借运动作为重要的协调机制，促进了晶界滑动的顺利进行。热变形中的微观缺陷易产生于γ相晶粒与α2／γ为层片晶团构成的晶界处。A Selfmade high-temperature tensional machine was used to study the deformation of duplex microstructure of Ti-33Al-3Cr-0.5Mo alloy at elevated temperature. The results indicated that 194% elogation was obtained under the condition of proper deformational process at 970℃. It was thought that the dislocation motion in grains and grain-boundaries, as an important coordination mechanism, promoted the development of grain-boundary sliding. The micro-defect in the hot deformational specimen was easy to occur in the boundaries between γ-phase grains,and α2/γ lamella colonies.

关 键 词：高温变形 钛铝合金 双态组织 晶界滑动 

分 类 号：TG146.23[一般工业技术—材料科学与工程]