摘要
本文利用透射电子显微术（ＴＥＭ）研究了Ｔｉ_３Ａｌ基合金轴向疲劳试样的变形组织，重点分析了初生α_２晶粒的变形协调机制。研究表明，初生α_２晶粒内的（１１２０）α型位错塞积可形成亚晶界，亚晶的形成和发展是产生和协调晶粒和晶界变形的重要机制；晶内α型位错反应可形成六角位错网络；在β转变组织中，形变孪晶也是协调应变的一种形式。
he microstructure of Ti_3Al-base alloy in an axial fatigue condition has been observed by transmission electron microscope(TEM),and the coordinated mechanism of deformation of primary α_2 phase grains has been emphatically studied. It is showed that<1120> a-type dislocations can be accumulated to produce sub-grain boundary in primary α_2 phase grains. The production and development of subgrains is an important mechanism to coordinate the deformation of grains and grain boundary in the alloy. The a- type disloca-tions reaction cat form hexagonal network of dislocation. At the same time,deformed twins is a deform-tion method in transformed beta phase of the alloy.
出处
《材料工程》
EI
CAS
CSCD
北大核心
1994年第4期33-36,共4页
Journal of Materials Engineering
关键词
疲劳
位错
钛铝基合金
Ti_3Al-base alloy,Fatigue,Dislocation
