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赵雪婷,尚闪,张天向,张瑞杰,王先飞,李中权,韩志强.冷却速率对Mg-Gd-Y三元镁合金凝固组织影响的相场模拟[J].稀有金属材料与工程(英文),2020,49(11):3709~3717.[Zhao Xueting,Shang Shan,Zhang Tianxiang,Zhang Ruijie,Wang Xianfei,Li Zhongquan and Han Zhiqiang.Phase-field simulation on the influence of cooling rate on the solidification microstructure of Mg-Gd-Y ternary magnesium alloy[J].Rare Metal Materials and Engineering,2020,49(11):3709~3717.]
Phase-field simulation on the influence of cooling rate on the solidification microstructure of Mg-Gd-Y ternary magnesium alloy
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Received:October 17, 2019  Revised:February 13, 2020
DOI:
Key words: phase-field, simulation, Magnesium, microstructure, cooling  rate
Foundation item:国家重点基础研究发展计划(973计划),国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Zhao Xueting,Shang Shan,Zhang Tianxiang,Zhang Ruijie,Wang Xianfei,Li Zhongquan and Han Zhiqiang  
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Abstract:
      A phase-field model of ternary Mg-Gd-Y magnesium alloy was developed by coupling with the thermodynamics of Mg-Gd-Y system and considering cooling rate for the first time. It was applied to simulate the solidification microstructure and concentration distribution of GW103 (Mg-1.69mol%Gd-1.32mol%Y) alloy at different cooling rates both in one-grain and multigrain simulation cases. Then GW103 alloys were prepared via gravity casting method and characterized to verify the model. Results give new understanding that the GW103 alloy exhibits thick sixfold primary dendrite, a few protuberance-like secondary arms and even no higher-order arms, instead of developed dendrite. The ascending cooling rate results in refinement of microstructure of GW103, which exhibits smaller grain size, slimmer primary dendrite and less secondary arms in multigrain simulation case. Besides, higher cooling rate aggravates the solute enrichment and inhomogeneous distribution of Gd and Y in interdendritic area. The simulation and the experimental results are matched well.