Segregation of Mg-6Gd alloy under natural convection:From macro solute distribution to micro dendrite growth

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外文摘要：Segregation is a serious defect in alloy ingots which severely deteriorates materials performance.The segregation defect in Mg-6Gd alloy is studied by coupling macro thermal-solutal-convection transport and micro dendrite growth.The macroscopic fluid dynamics and mass transfer equations are resolved to forecast the segregation behavior under conditions of continuous temperature variation during the solidification process.The numerical model is validated by testing double-diffusive natural convection in a closed square cavity.A phase field model is then applied to simulate the micro dendrite growth,using macro undercooling and liquid flow velocity as boundary conditions.Results show that the multiscale segregation behavior,including macro solute distribution and micro dendritic morphology,is strongly dependent on the temperature condition and the liquid convection,which provides guidance for reducing and eliminating the segregation defect.

外文关键词：

magnesium alloysegregationnumerical simulationphase-field simulationmultiscale

作者：

Hong-xu Chen、Ang Zhang、Hao Li、Yu Gao、Yu-hong Cui、Guang-sheng Huang、Bin Jiang、Fu-sheng Pan

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作者单位：

National Engineering Research Center for Magnesium Alloys,National Key Laboratory of Advanced Casting Technologies,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYoung Elite Scientists Sponsorship Program by China Association for Science and Technology(CAST)

项目编号：

2021YFB37010005210112552471118U2037601U21A20482022QNRC001

出版年：

2024

DOI：

10.1007/s41230-024-4126-2

中国铸造

沈阳铸造研究所

中国铸造

CSTPCDEI

影响因子：0.299

ISSN：1672-6421

年,卷(期)：2024.21(5)