Segregation in squeeze casting 6061 aluminum alloy wheel spokes and its formation mechanism  

作　　者：Fan-bo Meng Hong-jun Huang Xiao-guang Yuan Xue-jian Lin Ze-wen Cui Xian-lei Hu 

机构地区：[1]School of Materials Science and Engineering,Shenyang University of Technology,Shenyang,110870,China [2]School of Materials Science and Engineering,Liaoning Technology University,Fuxin,123000,China [3]State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang,110004,China

出　　处：《China Foundry》2021年第1期45-51,共7页中国铸造（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.51875365)。

摘　　要：Segregation can seriously damage the mechanical properties of the aluminum alloys.6061 aluminum alloy wheel spokes were prepared by squeeze casting.To investigate the formation mechanism of segregation,the microstructure of the alloy was observed using scanning electron microscopy,energy dispersive spectrometry,X-ray diffraction and electron microprobe analysis methods.The Gibbs energy of each phase during solidification was calculated by JMat Pro.Results show that the segregation phases in the R-joint of the wheel spokes are mainly composed of Mg_(2)Si,β-Al Fe Si and Al_(5)Cu_(2)Mg_(8)Si_(6)intermetallics.During the solidification of the 6061 aluminum alloy wheels,Mg_(2)Si andα-Al Fe Si phases precipitate in the mushy zone at first.With the decrease of temperature,α-Al Fe Si transforms intoβ-Al Fe Si,while Al_(5)Cu_(2)Mg_(8)Si_(6)precipitates from the solid-state aluminum alloy after solidification.Segregation at the R-joint of wheel spokes is mainly caused by insufficient cooling,so the cooling during alloy solidification should be enhanced to avoid segregation.

关 键 词：6061 aluminum wheels SEGREGATION squeeze casting Mg_(2)Si Al FeSi Al_(5)Cu_(2)Mg_(8)Si_(6) 

分 类 号：TG146.21[一般工业技术—材料科学与工程]