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作 者:Ying-ying Hou Meng-wu Wu Feng Huang Xiao-bo Li Shou-mei Xiong
机构地区:[1]Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan 430070,China [2]School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China
出 处:《China Foundry》2022年第3期201-210,共10页中国铸造(英文版)
基 金:the National Natural Science Foundation of China(No.51805389);the Key R&D Program of Hubei Province,China(No.2021BAA048);the 111 Project(No.B17034);the fund of the Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology(No.XDQCKF2021011).
摘 要:The characteristics of defect bands in the microstructure of high pressure die casting(HPDC)AE44 magnesium alloy were investigated.Special attention was paid to the effects of process parameters during the HPDC process and casting structure on the distribution of defect bands.Results show that the defect bands are solute segregation bands with the enrichment of Al,Ce and La elements,which are basically in the form of Al_(11)RE_(3) phase.There is no obvious aggregation of porosities in the defect bands.The width of the inner defect band is 4-8 times larger than that of the outer one.The variation trends of the distribution of the inner and outer defect bands are not consistent under different process parameters and at different locations of castings.This is due to the discrepancy between the formation mechanisms of double defect bands.The filling and solidification behavior of the melt near the chilling layer is very complicated,which finally leads to a fluctuation of the width and location of the outer defect band.By affecting the content and aggregation degree of externally solidified crystals(ESCs)in the cross section of die castings,the process parameters and casting structure have a great influence on the distribution of the inner defect band.
关 键 词:high pressure die casting magnesium alloy AE44 defect band MICROSTRUCTURE
分 类 号:TG146.22[一般工业技术—材料科学与工程]
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