超高强Al-Zn-Mg-Cu系合金板材研究  

Study on ultrahigh strength Al-Zn-Mg-Cu alloy sheet

作　　者：黎柏康 赵佳蕾 秦翔智 李兵 赵巍 章晶林 周毅 李瑞霞 LI Baikang;ZHAO Jialei;QIN Xiangzhi;LI Bing;ZHAO Wei;ZHANG Jinglin;ZHOU Yi;LI Ruixia(Hubei Xinjinyang Resources Co.,Ltd.,Xiangyang 441000,China;Kunshan Jingwei New Material Research Institute Co.,Ltd.,Suzhou 215100,China)

机构地区：[1]湖北新金洋资源股份公司,湖北襄阳441000 [2]昆山晶微新材料研究院有限公司,江苏苏州215100

出　　处：《轻合金加工技术》2024年第5期22-26,共5页Light Alloy Fabrication Technology

摘　　要：利用金相显微镜、扫描电镜、拉伸试验机研究了超高Zn、Mg含量和微量Sc、Sm稀土元素对Al-Zn-Mg-Cu系合金板材微观组织和力学性能的影响。研究结果表明:板材强度随Zn、Mg元素含量的增加而提高;添加微量Sm元素对细化晶粒没有效果,且在基体中形成不能消除的含Sm第二相,对性能不利;Sc可有效细化铸锭晶粒,抑制再结晶,并显著提高板材强度,Sc元素添加量达到w(Sc)=0.2%可使板材屈服强度提升59 MPa,抗拉强度提升51 MPa;在高合金化的基础上复合添加w(Zr)=0.12%和w(Sc)=0.2%,板材屈服强度可达726 MPa,抗拉强度可达752 MPa。The effects of super high Zn,Mg content and trace Sc,Sm rare earch elements on microstructure and mechanical properties of Al-Zn-Mg-Cu alloy sheets have been studied,with metallographic microscope,scanning electron microscope and tensile testing machine.The results show that the strength increases as Zn and Mg content rises.The addition of trace Sm element doesn't affect grain refinement and forms Sm-contained second phase in the matrix that can not be eliminated and is to unfavorable properties.Sc can refine grains effectively,inhibit recrystallization and improve strength.The yield strength and tensile strength increases by 59 MPa and 51 MPa accordingly with addition of 0.2%Sc.The combined addition of w(Zr)=0.12%and w(Sc)=0.2%on the basis of high alloying sheet results in yield strength of 726 MPa and tensile strength of 752 MPa.

关 键 词：Al-Zn-Mg-Cu系合金板材 高合金化 稀土元素 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]