Microstructure analyses and phase-field simulation of partially divorced eutectic solidification in hypoeutectic Mg-Al Alloys  

作　　者：Joo-Hee Kang Jiwon Park Kyung Song Chang-Seok Oh Oleg Shchyglo Ingo Steinbach 

机构地区：[1]Korea Institute of Materials Science,Changwon 51508,Republic of Korea [2]Interdisciplinary Centre for Advanced Materials Simulation,Ruhr-University Bochum,44801 Bochum,Germany

出　　处：《Journal of Magnesium and Alloys》2022年第6期1672-1679,共8页镁合金学报（英文）

基　　金：supported by the Fundamental Research Program of Korea Institute of Materials Science(PNK7760 and PNK7770);the National Research Foundation of Korea(2020R1A2C2008416 and 2021M3H4A6A01049712)。

摘　　要：In this study the partially divorced eutectic microstructure ofα-Mg andβ-Mg17Al12was investigated by electron backscatter diffraction,transmission electron microscopy,and phase-field modeling in hypoeutectic Mg-Al alloys.The orientation relationships between the individual eutecticαgrains,eutecticβphase,and primaryαgrains were investigated.While the amount of eutectic morphology is primarily determined by the Al content,the in-depth microstructure analyses and the phase-field simulation suggest non-interactive nucleation and growth of eutecticαphase in theβphase grown on the interdendritic primaryαdendrites.Also,phase-field simulations showed a preferred nucleation sequence where theβphase nucleates first and subsequently triggers the nucleation of eutecticαphase at the movingβphase solidification front,which supports the microstructural analysis results.

关 键 词：Mg-Al alloy Partially divorced eutectic SOLIDIFICATION Electron backscatter diffraction Phase-Field modeling 

分 类 号：TG146.22[一般工业技术—材料科学与工程]