高合金化Al-Zn-Mg-Cu合金铸态及均匀化态组织  

As-cast and homogenized microstructure of Al-Zn-Mg-Cu alloy with high Zn content

作　　者：刘洪雷[1] 金龙兵[1,2] 刘俊涛[2] 王国军[1] 刘显东[1] 李锡武[2] 李志辉[2] 孙黎明[1] LIU Hong-lei JIN Long-bing LIU Jun-tao WANG Guo-jun LIU Xian-dong LI Xi-wu LI Zhi-hui SUN Li-ming(Northeast Light Alloy Co. , Ltd. , Harbin 150060, China State Key Laboratory of Non-Ferrous Metals and Process, General Research Institute for Non-Ferrous Metals, Beijing 100088, China)

机构地区：[1]东北轻合金有限责任公司,哈尔滨150060 [2]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088

出　　处：《轻合金加工技术》2016年第9期17-21,40,共6页Light Alloy Fabrication Technology

基　　金：国家重点基础研究发展计划资助项目(2012CB619504);国家自然科学基金项目(51271037)

摘　　要：采用热力学计算软件计算了一种高锌含量Al-Zn-Mg-Cu合金的凝固相,并采用金相显微镜、扫描电子显微镜和X射线衍射仪分析了合金的铸态、均匀化态组织。研究结果表明,合金的铸态组织主要由MgZn_2+Mg(Al,Cu,Zn)_2+α(Al)+(极少量)θ(Al_2Cu)相构成;450℃48 h均匀化退火后,Mg(Al,Cu,Zn)2仍有大量残留,470℃24 h均匀化退火后则完全回溶。Solidification phases in a Al-Zn-Mg-Cu alloy with high Zn content were calculated by thermal dynamic calculation software. The as-cast and homogenized microstructures were analyzed by optical microscopy,scanning electronic microscopy and x-ray diffraction.The research results show that the as-cast microstructure consists of MgZn2＋ Mg（ Al,Cu,Zn）2＋ α（ Al） ＋（ trace） θ（ Al2Cu） phases. There were still a lot of residues of Mg（ Al,Cu,Zn）2 phases after homogenization at 450℃ for 48 h,while dissolved completely after homogenization at 470℃ for 24 h.

关 键 词：AL-ZN-MG-CU合金 铸态组织 凝固相 均匀化 

分 类 号：TG146.21[一般工业技术—材料科学与工程]