研究强塑性变形过程中第二相回溶现象的现状及发展趋势  

Current Situation and Development of the Research on Re-Dissolution of Second Phases During Severe Plastic Deformation

作　　者：许晓嫦[1] 刘志义[1] 党朋[1] 于文斌[1] 谭曼玲[2] 吴纯[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]株洲工学院,湖南株洲412008

出　　处：《金属热处理》2005年第4期1-6,共6页Heat Treatment of Metals

基　　金：湖南省自然科学基金项目(03JJY3074)

摘　　要：综述了在室温强塑性变形过程中发现的新现象:第二相颗粒的回溶,合金基体重新形成过饱和固溶体。这种过饱和固溶体再时效时,析出相生成顺序不同于淬火固溶体。回溶固溶体再时效时生成的分散颗粒是强塑性变形产生的大角晶界、超细等轴状晶粒组织,具有热稳定、再加热时晶粒不易长大的特征。同时对第二相回溶的多种解释、回溶和再时效对材料组织和性能的影响进行了概述,并提出材料科学领域中应开发一个“应力热处理”的新分支。A new phenomenon of re-dissolution of second phases and re-formation of supersaturate solid solution found in processes of severe plastic deformation was summarized. During re-aging of this re-dissolution supersaturate solid solution the precipitation sequence of precipitates was different from that of as-quenched solid solution. The disperse particles produced during re-aging of re-dissolution supersaturate solid solution were critical contributions to the thermal stability of ultra fine equi-axis grain structure with high-angle boundaries arisen from severe plastic deformation and to maintain small grain growth during re-heating. A brief explanation for re-dissolution of second phase, effect of re-dissolution and re-aging on microstructure and property of materials was also made. It is proposed that a new branch should be developed in the field of materials science, i.e. Stress-Heat Treatment.

关 键 词：回溶 再时效 强塑性变形 固溶体 

分 类 号：TG113.25[金属学及工艺—物理冶金]