摘要
提出了一种制备 70 75铝合金厚板的多向锻造后再轧制的复合变形模式。结果发现 ,在 2 50～ 350℃范围内 ,应变率为 0 .1s- 1 的条件下 ,经过多向变形后 (变形系数达 2 1 .5) ,再进行轧制变形 (变形系数达 1 0 .5) ,可使 70 75铝合金获得 2～ 3μm的细晶组织。大变形条件下应变诱导高能位错区的形成及演变成再结晶核心是晶粒细化的组织特征 ;
A combination large deformation mode of multidirectional forging and sequent rolling is proposed for producing high performance aluminum alloy ultra-thick plates in this paper. The experiment shows that 2～3μm fine-grained structures in 7075 aluminum alloy can be obtained when total deformation coefficient λ=32 is achieved at the range of 250-350℃ under a strain rate of about 0.1s -1 . The development of fine-grained structure can be characterized by the formation of strain-induced high energy dislocation areas and then the areas transforming into nucleuses of recrystallization under large deformation at moderate temperature. The very fine secondary particles play an important role in retaining the stability of the fine-grained structures.
出处
《兵器材料科学与工程》
CAS
CSCD
2002年第4期18-21,共4页
Ordnance Material Science and Engineering
基金
国家重点基础研究发展规划"973"项目 (G19990 6 490 8)
华中科技大学塑性成形模拟及模具技术国家重点实验室开放基金资助项目 ( 0 1- 4)。
关键词
7075铝合金厚板
复合变形模式
多向锻造
轧制
晶粒细化
aluminum alloy
combination deformation mode
multidirectional forging
rolling
grain refinement
