Segregation of Mg-6Gd alloy under natural convection: From macro solute distribution to micro dendrite growth
Time：2026-06-08 Hits：1601
DOI: https://doi.org/10.1007/s41230-024-4126-2
Author: Hong-xu Chen, *Ang Zhang, Hao Li, Yu Gao, Yu-hong Cui, Guang-sheng Huang, Bin Jiang, and Fu-sheng Pan
*Ang Zhang
Ph. D., Associate Professor. He has been selected for the Youth Elite Scientists Sponsorship Program by China Association for Science and Technology. His primary research focuses on the microstructures and defect control of magnesium alloys. He has led more than ten projects, including task of National Science and Technology Major Project of China, sub-project of National Key Research and Development Program of China, National Natural Science Foundation of China (Youth and General Programs), National Natural Science Foundation of Chongqing China, Chongqing Technology Foresight Project, among others. Dr. Zhang has published over 60 SCI-indexed papers and possesses more than ten patents for inventions, software copyrights, and standards. His achievements have been recognized with several awards, including the First Prize of the China Nonferrous Metals Industry Science and Technology Award, the First Prize of the Sichuan-Chongqing Industry-University-Research Innovation Achievement Award, and the Second Prize of the Chongqing Science and Technology Progress Award.
E-mail: angzhang@cqu.edu.cn
Abstract:
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.
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