回归再时效热处理对7046铝合金显微组织与性能的影响  

Effects of Retrogression and Re-aging Treatment on Microstructure and Properties of 7046 Aluminum Alloy

作　　者：黎凡夫 夏鹏 陈斌 项胜前 朱世安 张留艳[1] 李润霞 Li Fanfu;Xia Peng;Chen Bin;Xiang Shengqian;Zhu Shian;Zhang Liuyan;Li Runxia(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510000;School of Materials Science and Engineering,Dongguan University of Technology,Dongguan 523808;Guangdong Haomei New Material Co.,Ltd.,Qingyuan 511500)

机构地区：[1]广东工业大学材料与能源学院,广州510000 [2]东莞理工学院材料科学与工程学院,东莞523808 [3]广东豪美新材股份有限公司,清远511500

出　　处：《特种铸造及有色合金》2024年第3期386-391,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51974092,52001073);广东省教育厅“创新强校工程”重点领域专项资助项目(2020ZDZX2058);广东省基础与应用基础研究基金区域联合基金重点资助项目(2020B1515120065);东莞市科技特派员资助项目(20221800500212)。

摘　　要：采用室温拉伸试验、极化曲线测试、透射电镜(TEM)等分析方法,研究了回归再时效(RRA)热处理过程中回归温度、回归时间对7046铝合金组织和性能的影响。结果表明,适当的RRA工艺可使合金具有良好的耐腐蚀性能,强度上也不低于T6态合金。经120℃×24 h预时效+180℃×15 min回归+120℃×24 h再时效的RRA工艺处理后,合金综合力学性能达到最优,抗拉强度、屈服强度分别为490.3 MPa、467.8 MPa,高于T6态的487.1 MPa、452.7 MPa;同时耐腐蚀性能也有了显著的提升,自腐蚀电流密度为8.616×10^(-7)A/cm^(2),为T6态的18.9%。Effects of retrogression temperature and time on microstructure and properties of 7046 aluminum alloy were investigated by means of tensile test,potentiodynamic polarization test and TEM observation.The results indicate that desirable corrosion resistance can be obtained after proper RRA treatment,and the strength is close to that of T6 treated ones.The optimal properties are achieved after pre-aging at 120℃for 24 h,followed by retrogression at 180℃for 15 min and re-aging at 120℃for 24 h,where the tensile strength and yield strength reach 490.3 MPa and 467.8 MPa,respectively,which are higher than those of the T6-treated ones(487.1 MPa and 452.7 MPa).Moreover,the corrosion resistance is enhanced significantly,where the self-corrosion current density is 8.616×10^(-7)A/cm^(2),which is 18.9%of T6-treated specimens.

关 键 词：7046铝合金 回归再时效 显微组织 力学性能 耐腐蚀性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]