6061粉末压制块在部分重熔过程中的组织演变  

Microstructural Evolution of 6061 Bulk Alloy Prepared by Cold Pressing of Alloy Powder During Partial Remelting

作　　者：陈玉狮 陈体军[1,2] 张素卿[1] 李普博 王儒亮 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室 [2]兰州理工大学有色金属合金及加工教育部重点实验室

出　　处：《特种铸造及有色合金》2014年第4期360-363,共4页Special Casting & Nonferrous Alloys

基　　金：教育部新世纪优秀人才培养计划资助项目(NCET-10-0023);兰州理工大学红柳杰出人才培养计划资助项目

摘　　要：研究了部分重熔过程中,6061铝合金粉末压制块的组织演变过程及其机理,讨论了重熔温度对半固态组织的影响。结果表明,6061铝合金粉末压制块经部分重熔后,能获得细小、圆整的半固态组织。部分重熔可分为3个阶段:初期晶粒的快速粗化、组织分离与球状化以及最后初生相颗粒的粗化。适当提高温度有利于获得理想的半固态组织。The microstructural evolution and mechanism of 6061 bulk alloy prepared by cold pressing of alloy powder were investigated during partial remelting. Meanwhile, effects of heating temperature on semisolid microstructure of the 6061 alloy prepared were analyzed. It is found that after partial remelt- ing, semi-solid microstructure with small and nearly spherical particles can be obtained in the alloy pre- pared. The microstructural evolution can be divided into three stages： the rapid coarsening of grains, structural separation and spheroidization, the final coarsening behavior of primary particles. Further- more, proper elevated heating temperature is beneficial to generating ideal semi-solid microstructure.

关 键 词：6061合金 粉末压制块 部分重熔 组织演变 

分 类 号：TG249.9[金属学及工艺—铸造]