时效制度对新型Al-Zn-Mg-Cu合金组织与性能的影响  

Effect of aging on microstructure and properties of new Al-Zn-Mg-Cu alloy

作　　者：薛克敏[1] 李云辉 许兵 严思梁 李萍[1] Xue Kemin;Li Yunhui;Xu Bing;Yan Siliang;Li Ping(School of Materials Science and Engineering,Hefei Universily of Technology,Hefei Anhui 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《金属热处理》2021年第3期1-7,共7页Heat Treatment of Metals

基　　金：国家自然科学基金青年科学基金(51705119);自然科学基金面上项目(51575153)。

摘　　要：采用X射线衍射、金相和扫描电镜等手段,结合力学性能检测和电导率测定,研究了单级时效和双级时效处理对铸态新型Al-Zn-Mg-Cu合金微观组织和综合性能的影响。结果表明:随时效温度的升高和时效时间的延长,晶粒尺寸缓慢增大,电导率逐渐增加。铸态新型Al-Zn-Mg-Cu合金最佳的单级时效工艺为135℃×12 h,此时合金的硬度为231.8 HV0.2、抗拉强度为568 MPa、伸长率为2.8%、电导率为33.7%IACS;最佳的第二级时效制度为155℃×4 h,此时合金的硬度为216.9 HV0.2、抗拉强度为558.7 MPa、伸长率为4.1%、电导率为35.2%IACS。Influences of one-stage and two-stage aging on the microstructure and comprehensive properties of a new Al-Zn-Mg-Cu alloy were studied by means of X-ray diffraction,optical metallography and scanning electron microscopy in combination with mechanical properties measurement and electrical conductivity measurement.The results show that with the increases of aging temperature and aging time,grain size increases slowly and the conductivity increases gradually.The optimal one-stage aging process of the as-cast new Al-Zn-Mg-Cu alloy is 135℃×12 h,the hardness of the alloy is 231.8 HV0.2,the tensile strength is 568 MPa,the elongation is 2.8%,the conductivity is33.7%IACS.The optimal two-stage aging process is 155℃×4 h,the hardness of the alloy is 216.9 HV0.2,the tensile strength is 558.7 MPa,the elongation is 4.1%,and the conductivity is 35.2%IACS.

关 键 词：单级时效 双级时效 AL-ZN-MG-CU合金 微观组织 综合性能 

分 类 号：TG166.3[金属学及工艺—热处理]