Sc含量对Al9.0Zn2.5Mg2.2Cu0.2Zr合金铸态组织的影响  

The effect of addition of Sc on as-cast microstructure of A19.0Zn2.5Mg2.2Cu0.2Zralloy

作　　者：常昭楠 刘奎仁 倪帅 韩庆 陈建设 李斌川 CHANG Zhaonan;LIU Kuiren;NI Shuai;HAN Qing;CHEN Jjanshe;LI Binchuan(School of Metallurgy,Northeastern University,Shenyang 110819,China;Key Laboratory of Nonferrous Metal Resource Recycling,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]沈阳市有色金属资源循环利用重点实验室,辽宁沈阳110819

出　　处：《轻合金加工技术》2024年第2期17-21,共5页Light Alloy Fabrication Technology

摘　　要：本文研究了Sc添加量对Al9.0Zn2.5Mg2.2Cu0.2Zr合金铸态组织的影响。结果表明,微量Sc与Zr协同可形成Al_(3)(Sc,Zr)第二相,在铸造过程中具有促进非均质形核、细化铸态晶粒的作用,并对合金共晶组织有明显的变质作用。但铸态合金中部分可达微米级初生Al_(3)(Sc,Zr)第二相对合金的加工性能和力学性能易产生不良影响。The research was conducted on the effect of Sc addition on the as-cast organization of A19.0Zn2.5Mg2.2Cu0.2Zr aluminum alloy.The results show that the second phase of Al_(3)(Sc,Zr),which can be formed by the synergy of trace Sc and Zr,has the functions of promoting non-homogeneous nucleation and refining the as-cast grains during casting process,and it has an obvious metamorphic effect on the eutectic microstructure of the alloy.However,some primary Al_(3)(Sc,Zr)second phases in cast alloys that can reach the micrometer level may adversely affect the machinability and mechanical properties of the alloys.

关 键 词：超高强铝合金 Al9.0Zn2.5Mg2.2Cu0.2Zr合金 Al_(3)(Sc Zr)第二相 共晶组织 显微组织 

分 类 号：TG166.3[金属学及工艺—热处理]