双级时效对Al-8Zn-2Mg-2Cu合金组织与性能的影响  

Effects of double aging on the microstructures and properties of Al-8Zn-2Mg-2Cu alloy

作　　者：冯迪[1] 王国迎 张新明[2] 陈洪美[1] 金云学[1] 曹文奎 许程轶 张楠 FENG Di;WANG Guoying;ZHANG Xinming;CHEN Hongmei;JIN Yunxue;CAO Wenkui;XU Chengyi;ZHANG Nan(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]江苏科技大学材料科学与工程学院,镇江212003 [2]中南大学材料科学与工程学院,长沙410083

出　　处：《江苏科技大学学报（自然科学版）》2018年第5期642-650,共9页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家重点基础研究发展规划(973)(2012CB619500);国家自然科学基金资助项目(51801082);江苏省自然科学基金资助项目(BK20160560);江苏省高校自然科学基金资助项目(16KJB430010);江苏科技大学本科生创新计划项目

摘　　要：为提高Al-8Zn-2Mg-2Cu合金的综合力学性能和耐蚀性能,采用硬度测试、电导率测试、室温拉伸实验、剥落腐蚀实验及透射电镜(TEM)观察,研究了双级时效对Al-8Zn-2Mg-2Cu合金组织及性能的影响.结果表明:第二级时效参数决定了合金的综合性能;第二级时效温度越高,保温时间越长,合金的硬度和强度越低,但是电导率和抗剥落腐蚀性能越好;经过120℃×6 h+160℃×16 h的双级时效处理,Al-8Zn-2Mg-2Cu合金的抗拉强度、屈服强度、延伸率、断裂韧性及剥落腐蚀等级分别为:580 MPa,549 MPa,12%,KIC=24. 7 MPa·m1/2和EB.In order to improve the comprehensive mechanical properties and corrosion resistance of Al-8Zn-2Mg-2Cu alloy,the effect of double aging on the microstructure and properties of Al-8Zn-2Mg-2Cu alloy were investigated by hardness test,electrical conductivity test,room-temperature tensile test,exfoliation corrosion experiment and transmission electron microscopy(TEM)observation.The results showed that the comprehensive performance was mainly determined by the secondary aging treatment.The hardness and strength decrease while the electrical conductivity and corrosion resistance level increase with the increasing of the secondary aging temperature and time.After double aged by 120℃×6h+160℃×16h,the tensile strength,yield strength,elongation,fracture toughness and exfoliation corrosion resistance level of the Al-8Zn-2Mg-2Cu alloy are 580 MPa,549MPa,12%,K IC=24.7MPa·m 1/2 and EB,respectively.

关 键 词：Al-8Zn-2Mg-2Cu 双级时效 力学性能 耐蚀性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]