摘要
采用EBSD技术研究了TC17钛合金片状组织在热变形过程中的球化演变规律,并对比分析了变形前后α相与β相间Burgers关系的变化。结果表明,热变形导致β相发生明显的动态再结晶。变形初期,片状组织内部首先在动态回复作用下形成位错亚结构,此时各亚结构间的亚晶界均为小角度晶界;随着变形的增大,亚晶界转化为大角度晶界导致片状α的破裂;破碎α相的相界再通过扩散作用继续迁移,最终实现α相的球化。热变形在改变片状组织形貌和稳定性的同时,也破坏了片状组织中α相和β相间严格的Burgers关系,热变形过程中,柱滑移和其他滑移系或孪晶系的启动是造成α相与β相间严格Burgers关系破坏的根本原因。
The microstructure evolution and the change of Burgers orientation relationship between α and β phase of TC17 titanium alloy with initial lamellar microstructure were researched by EBSD. The results show that dynamic recrystallization of β phase occurs during the hot deformation process. Meanwhile, the dynamic globularization of α phase includes the formation of subboundary and the fragmentation of α phase. The fragmentized α phase eventually transforms to globularized particle. In addition, the strict Burgers orientation relationship between α and β phase is destroyed, due to the activation of prismatic slip system and other slip or twin systems.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2017年第10期2895-2899,共5页
Rare Metal Materials and Engineering
基金
教育部博士点基金(20136102110034)
新世纪优秀人才支持计划(NCET-07-0696)
