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冷卻速率對(duì)Mg-Gd-Y三元鎂合金凝固組織影響的相場(chǎng)模擬
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作者單位:

1.清華大學(xué) 材料學(xué)院;2.北京科技大學(xué) 鋼鐵共性技術(shù)協(xié)同創(chuàng)新中心;3.上海航天精密機(jī)械研究所

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國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）,國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Phase-field simulation on the influence of cooling rate on the solidification microstructure of Mg-Gd-Y ternary magnesium alloy
Author:
Affiliation:

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

Fund Project:

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

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    摘要:

    結(jié)合Mg-Gd-Y體系熱、動(dòng)力學(xué)模型,首次考慮冷卻速率,建立了Mg-Gd-Y三元鎂合金的相場(chǎng)模型。應(yīng)用該模型模擬了GW103(Mg-1.69mol%Gd-1.32mol%Y)合金在不同冷卻速率下的凝固組織微觀形貌和成分分布。采用重力鑄造法制備GW103合金并對(duì)其進(jìn)行實(shí)驗(yàn)表征以驗(yàn)證相場(chǎng)模型。結(jié)果表明,GW103合金呈不發(fā)達(dá)枝晶形貌且一次枝晶臂具六次對(duì)稱性,二次枝晶臂呈突起狀且無更高次枝晶臂。在多晶粒相場(chǎng)模擬中,隨著冷卻速率的增加GW103微觀組織細(xì)化,晶粒尺寸減小、一次枝晶臂變細(xì)、二次枝晶臂數(shù)目減少。較高的冷卻速率加劇了Gd和Y在枝晶間的溶質(zhì)富集現(xiàn)象,令成分分布更不均勻。

    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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引用本文

趙雪婷,尚閃,張?zhí)煜?張瑞杰,王先飛,李中權(quán),韓志強(qiáng).冷卻速率對(duì)Mg-Gd-Y三元鎂合金凝固組織影響的相場(chǎng)模擬[J].稀有金屬材料與工程,2020,49(11):3709~3717.[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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  • 收稿日期:2019-10-17
  • 最后修改日期:2020-02-13
  • 錄用日期:2020-02-20
  • 在線發(fā)布日期: 2020-12-09
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