Aging precipitation behavior and properties of Al-Zn-Mg-Cu-Zr-Er alloy at different quenching rates  

不同淬火速率下Al-Zn-Mg-Cu-Zr-Er合金的时效析出行为及性能

作　　者：Yi-chang WANG Xiao-dong WU Lu YUE Ming-xing GUO Ling-fei CAO 王一唱;吴晓东;岳露;郭明星;曹玲飞(重庆大学材料科学与工程学院轻合金国际联合实验室(教育部),重庆400044;北京科技大学新金属材料国家重点实验室,北京100083;重庆大学沈阳材料科学国家研究中心,重庆400044)

机构地区：[1]International Joint Laboratory for Light Alloys(Ministry of Education),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [2]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China [3]Shenyang National Laboratory for Materials Science,Chongqing University,Chongqing 400044,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第4期1070-1082,共13页中国有色金属学报（英文版）

基　　金：the financial supports from the National Natural Science Foundation of China(No.51871033);the Opening Project of State Key Laboratory for Advanced Metals and Materials,China(No.2020-ZD02)。

摘　　要：The effect of quenching rate on the aging precipitation behavior and properties of Al-Zn-Mg-Cu-Zr-Er alloy was investigated.The scanning electron microscopy,transmission electron microscopy,and atom probe tomography were used to study the characteristics of clusters and precipitates in the alloy.The quench-inducedηphase and a large number of clusters are formed in the air-cooled alloy with the slowest cooling rate,which contributes to an increment of hardness by 24%(HV 26)compared with that of the water-quenched one.However,the aging hardening response speed and peak-aged hardness of the alloy increase with the increase of quenching rate.Meanwhile,the water-quenched alloy after peak aging also has the highest strength,elongation,and corrosion resistance,which is due to the high driving force and increased number density of aging precipitates,and the narrowed precipitate free zones.研究淬火速率对Al-Zn-Mg-Cu-Zr-Er合金时效析出行为和性能的影响。采用扫描电镜、透射电镜和原子探针层析技术等研究合金中团簇和析出相的析出行为与特征。固溶后冷却速率最慢的空冷合金中会形成淬火诱导η相及大量团簇,使其淬火态硬度比水淬合金的提高了24%(HV 26)。然而,合金的时效硬化响应速度和峰时效硬度随淬火速率的增加而增大,峰时效态的水淬合金具有最高的强度、伸长率和耐蚀性,这是由于水淬合金时效析出驱动力较大,使析出相的数量密度增大及晶间无析出带的宽度减小。

关 键 词：Al-Zn-Mg-Cu-Zr-Er alloy quenching rate aging treatment PRECIPITATE strengthening 

分 类 号：TG156.3[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]