Segregation behavior and its regulating process in as-cast magnesium alloy containing heavy rare earth

查看全文 作　　者：Xin [1,2]Tong;Guoqiang [1,3]You;Fanjin [1]Yao;Mahmoud [4]Ebrahimi;Xinyue [1]Deng;Shokouh [5]Attarilar

机构地区：[1]College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China;[2]National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;[3]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China;[4]Department of Mechanical Engineering,Faculty of Engineering,University of Maragheh,P.O.Box 55136-533,Maragheh,Iran;[5]School of Materials Science and Engineering,Iran University of Science and Technology,Tehran,Iran

出　　处：《Journal of Rare Earths》索引2022年第40卷第8期,共14页

基　　金：Project supported by Key Research&Development Project of Guangdong Province(2020B010186002);National Natural Science Foundation of China(U2037601);Science and Technology Project of Sichuan Province(2020YFG0213)。 摘　　要：Specific gravity segregation that occurs during the smelting process always leads to the low composition homogeneity and poor performance stability of the magnesium-rare earth(Mg-RE)alloys.In this study,the segregation behavior of Mg-Gd alloy was investigated by sampling from different locations in the ingot fabricated in a resistance furnace without a pouring process.The combined application of induction-heating and mechanical stirring with various speeds(0-130 r/min)was applied to promote the distribution homogeneity of Gd atoms.In the resistance-heating fabricated ingot,Gd content at the bottom section reaches 407%of that at the top.The coarse dendrites surrounded by the network-like eutectic structures are responsible for the brittle fracture with a poor elongation of 3.7%.By the combined employment of the induction heating and mechanical stirring with the speed of 87 r/min at 740℃for 40 s,the variation of the Gd content within the whole ingot can be reduced to be the minimum of 0.23 wt%.Corresponding formation and regulating models of segregation were also proposed.However,the cooling rate of the melt is reduced by the continuous increase of the stirring speed to 130 r/min,which results in the grain coarsening and lower homogeneity of the ingot. 关键词：Mg-RE alloy SEGREGATION Composition homogeneity Melting process Mechanical stirring Rare earths

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Segregation behavior and its regulating process in as-cast magnesium alloy containing heavy rare earth

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