均匀化处理对高Zn超高强铝合金微观组织演变的影响  

Effect of Homogenization Treatment on Microstructure Evolution of High Zn Ultra-High Strength Aluminum Alloy

作　　者：马韬 马鸿彬 林顺岩 谢志强 蒋斌 褚庆元 Ma Tao;Ma Hongbin;Lin Shunyan;Xie Zhiqiang;Jiang Bin;Chu Qingyuan(Yuantai High Conductivity Materials(Shanxi)Co.,Ltd.,Lvliang 035300,China;Yuantai High Conductivity Material(Shanxi)Research Institute,Lvliang 035300,China;Chongqing University,Materials Science and Engineering College,Chongqing 400044,China)

机构地区：[1]元泰高导材料(山西)有限公司,山西吕梁035300 [2]元泰高导材料(山西)研究院,山西吕梁035300 [3]重庆大学材料与科学工程学院,重庆400044

出　　处：《有色金属加工》2024年第2期15-20,共6页Nonferrous Metals Processing

基　　金：国家重点研发计划项目(2016YFB0300904)。

摘　　要：采用金相光学显微镜、扫描电子显微镜(SEM)等,检测分析了高Zn超高强度铝合金铸锭均匀化前后的组织形貌及变化。结果表明,合金铸态中存在严重的枝晶偏析,合金中的相主要是由MgZn_(2)相和T(AlZnMgCu)相组成的可溶金属间化合物,以及由Mn、Fe和Ni三种元素形成的难溶金属间化合物。铸锭均匀化热处理后的结果显示,与7050合金和7055合金等Zn含量较低的铝合金不同,在合金中Zn含量高达9.8%的情况下没有出现T相向S(Al_(2)CuMg)相的转化。分析表明,这一现象与Zn含量及Zn的扩散密切相关,目前知道Zn含量越高,转化过程越困难。In this paper,metallographic optical microscope and scanning electron microscope(SEM)are used to detect and analyze the microstructure and changes of high Zn and ultra-high strength aluminum alloy ingot before and after homogenization.The results show that severe dendrite segregation exists in the alloy as cast.The main phases in the alloy are soluble intermetallic compounds composed of MgZn_(2) phase and T(AlZnMgCu)phase,and refractory intermetallic compounds composed of Mn,Fe and Ni.The results of homogenized heat treatment of the ingot show that,unlike the aluminum alloys with low Zn content such as 7050 alloy and 7055 alloy,there is no T to S(Al_(2)CuMg)phase conversion when the Zn content of the alloy is as high as 9.8%.The analysis shows that this phenomenon is closely related to the content and diffusion of Zn,and it is known that the higher the content of Zn,the more difficult the conversion process.

关 键 词：高Zn超高强铝合金 均匀化 微观组织 S(Al_(2)CuMg)相 

分 类 号：TG146.24[一般工业技术—材料科学与工程]