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Phase-field simulation on the influence of cooling rate on the solidification microstructure of Mg-Gd-Y ternary magnesium alloy
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1.School of Materials Science and Engineering, Tsinghua University;2.Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing;3.Shanghai Spaceflight Precision Machinery Institute

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Fund Project:

The National Key Research and Development Program of China (2016YFB0701204), The National Natural Science Foundation of China (U1737208)

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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.

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[Zhao Xueting, Shang Shan, Zhang Tianxiang, Zhang Ruijie, Wang Xianfei, Li Zhongquan, 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.]
DOI:10.12442/j. issn.1002-185X.20190858

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History
  • Received:October 17,2019
  • Revised:February 13,2020
  • Adopted:February 20,2020
  • Online: December 09,2020
  • Published: