摘要
用透射电镜小角度会聚束产生的明税Kikuchi线测量了大晶粒LC9超硬铝合金在高温慢速热扭转过程中的晶内亚晶界角变化，发现亚晶界角随变形量的增加逐步增加，表明连续动态再结晶是该材料在高温慢速预变形中晶粒细化的主要机制，双态分布的析出相在连续动态再结晶中所起的作用与其在常规的热机械加工过程中所起作用有所不同，弥散分布的小沉淀相阻碍位错的滑移和攀移并钉扎晶界与亚晶界。
Sharp Kikuchi patterns generated by convergent beam electron diffeaction (CBED) areintroduced for accurate measuremellt of sub-grain misorientation evolution in large grains in slow speed hottorsion of LC9 alloy. Gradual increase of sub-grain misorientation with strain indicates that colltinuousdynandc recrystallization is the mechanism by which grains are refined. The role played by bimodel-distributed second phase particles is different from that in normal thermomechanical processing.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第10期1031-1035,共5页
Acta Metallurgica Sinica
基金
国家教委先进材料开放实验室资助
