摘要
Ｔｉ－２５Ａｌ－１０Ｎｂ－３Ｖ－１Ｍｏ（ａｔ．－％）合金在９００－９８０℃温度范围和１×１０^（－３）Ｓ^（－１）拉伸速率下显示了良好的超塑性能，δ＝３８２％．其超塑形变受控于晶界滑动（主要为α_２／α_２晶界滑动），并协调以扩散、位错、位错环和层错机制．扩散协调机制表现为螺旋位错和割阶的攀移，位错协调制主要为的位错的滑移．位错环主要为的切变型位错环，并伴有少量的扩散切变型位错环．
Superior superplasticity up to 382 % is noticeable when alloy Ti-25AI-10Nb-3V-1 Mo(at.-%)is deformed at temperature 900-980℃ and a strain rate of 1×10￣(-3) s￣(-1). The superplastic model for grain boundary sliding combined with diffusion,dislocation slip, dislocation loop and stacking fault accommodation processes is recognized.Diffusion accommodation process is characteristic of helical dislocation and superjog climb by atomic diffusion mechanism. It is well established that type dislocation with dominate the dislocation accommodation process. The majority of dislocation loops are identified as shearing ones with,and a few of them are determined to be shearing plus diffusion dislocation loops with .
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第10期B465-B470,共6页
Acta Metallurgica Sinica
关键词
TI3AL基合金
超塑形变
微观观察
Ti_3AI alloy
superplastic deformation
microscopic observation
