退火处理对含铒Al-Mg-Zn合金组织和性能的影响  

Effect of annealing treatment on microstructure and property of Er-containing Al-Mg-Zn alloys

作　　者：高杰明 黄晖[1] 石薇 魏午 文胜平 韩颖[3] 聂祚仁[1] GAO Jieming;HUANG Hui;SHI Wei;WEI Wu;WEN Shengping;HAN Ying;NIE Zuoren(Key Laboratory of Advanced Functional Materials(Ministry of Eduction),Beijing University of Technology,Beijing 100124,China;Institute of Corrosion Science and Technology,Guangzhou 510530,China;Northeast Light Alloy Co.,Ltd.,Harbin 150000,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 [2]广东腐蚀科学与技术创新研究院,广州510530 [3]东北轻合金有限责任公司,哈尔滨150000

出　　处：《材料工程》2022年第11期101-108,共8页Journal of Materials Engineering

基　　金：北京市教委科研计划科技一般项目(KM202110005010)。

摘　　要：使用硬度测量、室温拉伸、光学显微镜(OM)、电子背散射衍射(EBSD)、透射电镜(TEM)等测试方法,对不同退火处理的Al-6.0Mg-1.0Zn-0.8Mn-0.2Cu-0.2Er-0.1Zr热轧板的室温拉伸性能、晶间腐蚀性能和合金的宏微观组织进行了系统研究。结果表明:合金板材的稳定化工艺窗口为230℃/18 h,240℃/6 h,250~270℃/2 h;在250℃/2 h退火后,合金板材的屈服强度为263 MPa,失重值为6.732 mg/cm^(2)。结合力学性能和腐蚀性能,优选250℃/2 h为热轧板的最佳稳定化工艺。通过选区电子衍射和能谱图分析,发现晶界与晶内的析出相均为T-Mg_(32)(AlZn)_(49)相。经过250℃/2 h退火后,晶内T相逐渐长大回溶,形貌由方块状转变为短棒状。而T相在晶界处呈断续分布,且间距变大,所以呈现良好的耐蚀性。Effect of annealing treatment on tensile properties,intergranular corrosion,macrostructure and microstructure of Al-6.0Mg-1.0Zn-0.8Mn-0.2Cu-0.2Er-0.1Zr hot-rolled plate as studied by hardness testing,tensile testing,intergranular corrosion,OM,EBSD and TEM.The results show that the stabilization work window of the plate is 230℃/18 h,240℃/6 h and 250-270℃/2 h.After 250℃/2 h,the alloy plate presents the best comprehensive performance with 263 MPa yield strength and 6.732 mg/cm^(2)mass loss.250℃/2 h is selected as the optimal stabilization process for hot rolled plate by combining the mechanical properties and corrosion resistance.Through selected area electron diffraction(SEAD)and energy spectrum analysis,the second phase at the grain boundary and in the grain are all the T-Mg_(32)(AlZn)_(49) phases.After annealing at 250℃/2 h,the T phase in grains gradually grows up and re-dissolves,and the morphology changes from square to short rod.The T phase are discontinuous and the spacing becomes larger at grain boundary,which shows good corrosion resistance.

关 键 词：含铒Al-Mg-Zn合金 稳定化 晶间腐蚀 T相 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG146.453[金属学及工艺—金属材料]