综合提升Al-Zn-Mg-Er-Zr合金强度和耐蚀性的双级时效研究  

Enhanced Mechanical Properties and Corrosion Resistance of Novel Al-Zn-Mg-Er-Zr Alloy by Two-Stage Aging Treatment

作　　者：陈炯燊 荣莉 魏午 黄晖[1] 高坤元 吴晓蓝 文胜平 亓鹏 聂祚仁[1] Chen Jiongshen;Rong Li;Wei Wu;Huang Hui;Gao Kunyuan;Wu Xiaolan;Wen Shengping;Qi Peng;Nie Zuoren(Key Laboratory of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学新型功能材料教育部重点实验室,北京100124

出　　处：《稀有金属材料与工程》2023年第7期2453-2460,共8页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2021YFB3700901)。

摘　　要：本研究以Al-Zn-Mg-Er-Zr合金为研究对象,测试获得合金在不同时效工艺下硬度、电导率、力学性能、剥落腐蚀性能的变化规律,同时使用EBSD、XRD、SEM及TEM等组织与成分表征手段对其微观组织进行分析,阐明合金最佳综合性能与其组织模式的关系。结果表明:最优的双级时效工艺为90℃/12 h+145℃/18 h;此工艺下的屈服强度为388 MPa,延伸率为14.0%,剥落腐蚀评级为PB,此时合金主要强化相(GP区和η′亚稳相)在晶内大量弥散析出,晶界处的η相呈断续分布。对比该合金T6(120℃/24 h)单级时效处理态性能:屈服强度为328 MPa,延伸率为17.75%,剥落腐蚀评级为EC,双级时效后合金综合性能得到显著提升。The mechanical properties and corrosion resistance of a novel Al-Zn-Mg-Er-Zr alloy under different aging processes were systematically studied.The microstructure of the alloy was analyzed by EBSD,XRD,SEM,TEM to understand the relationship between the best comprehensive properties of the alloy and its microstructure mode.It was found that the excellent two-stage aging process was 90 ℃/12 h+145 ℃/18 h,the corresponding yield strength and elongation were 388 MPa and 14.0%,the susceptibility to exfoliation corrosion was PB.At the same time,the main strengthening phases(GP zone and η′ phase) of the alloy numerously precipitated in the matrix,the ηphase at the grain boundary was discontinuous.

关 键 词：Al-Zn-Mg-Er-Zr 双级时效 微观组织 力学性能 剥落腐蚀 

分 类 号：TG146.21[一般工业技术—材料科学与工程]