自孕育法制备ZA27合金半固态浆料水淬组织  

Microstructure of ZA27 Alloy Water-quenched Semi-solid Slurry Prepared by Self-inoculation Method

作　　者：邱谨[1] 李元东[1,2] 李明[1] 张继渊[1] 郑宏强[1] 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室 [2]兰州理工大学有色金属合金省部共建教育部重点实验室

出　　处：《特种铸造及有色合金》2016年第3期252-255,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51464031)

摘　　要：采用自孕育法制备了ZA27合金半固态浆料,研究了不同熔体处理温度、等温保温温度和等温保温时间对ZA27合金半固态浆料水淬组织的影响。结果表明,自孕育法制备半固态浆料,其形核包括两个阶段,能够有效细化ZA27合金的晶粒,获得细小的蔷薇状等轴晶。在等温保温球化过程中,随等温保温时间的延长,平均晶粒尺寸不断增加,形状因子先减小后增大。适合ZA27合金半固态浆料的等温保温温度为470℃,等温保温时间为3min,平均晶粒尺寸为60.02μm。The semi-solid slurry of ZA27 casting alloy was prepared by self-inoculation method.Waterquenched microstructure of ZA27semi-solid slurry at different treatment temperature,isothermal holding temperature and holding time was observed.The results indicate that the self-inoculation method with two inoculation stages can refine effectively ZA27 melt to achieve fine rosette equaixed grain.During isothermal holding process,average grain size of the ZA27 alloy slurry is increased with isothermal holding time increase,while grain shape factor is increased firstly and then decreased.With isothermal holding temperature of 470℃and isothermal holding time of 3min,the corresponding average grain size is 60.02μm.

关 键 词：自孕育法 水淬组织 形核 等温保温 

分 类 号：TG291[金属学及工艺—铸造]