Research on microstructure in as-cast 7A55 aluminum alloy and its evolution during homogenization

查看全文 作　　者：LV [1,2]Xinyu;GUO [1]Erjun;LI [3]Zhihui;WANG [2]Guojun

机构地区：[1]The School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China;[2]Northeast light alloy Co., Ltd., Harbin 150060, China;[3]State Key Laboratory of Nonferrous Metals and Processes, General Research Institute for Nonferrous Metals, Beijing 100088, China

出　　处：《Rare Metals》索引2011年第30卷第6期,共5页

基　　金：financially supported by the National Key Technologies R&D Program of China (No.2007BAE38B06);the National Natural Science Foundation of China (No.50904010) 摘　　要：The microstructure of the as-cast 7A55 aluminum alloy and its evolution during homogenization were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and differential scanning calorimetry (DSC) analysis. The results indicate that the microstructure of the as-cast 7A55 aluminum alloy mainly consists of the dendritic network of aluminum solid solution, Al/AlZnMgCu eutectic phases, and intermetallic compounds MgZn2, Al2CuMg, Al7Cu2Fe, and Al23CuFe4. After homogenization at 470°C for 48 h, Al/AlZnMgCu eutectic phases are dissolved into the matrix, and a small amount of high melting-point secondary phases were formed, which results in an increasing of the starting melting temperature of 7A55 aluminum alloy. The high melting-point secondary phases were eliminated mostly when the homogenization time achieved to 72 h. Therefore, the reasonable homogenization heat treatment process for 7A55 aluminum alloy ingots was chosen as 470°C/72 h. 关键词：7A55铝合金同质化显微结构 AlZnMgCu 扫描电子显微镜演变铸态微观结构

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Research on microstructure in as-cast 7A55 aluminum alloy and its evolution during homogenization

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