2、Mg7Zn3、Mg2Sn相、MgSnGd相組成。MgSnGd相為高溫相，在合金凝固過程中最先形成，改變了凝固過程，使晶界處半連續(xù)第二相轉(zhuǎn)變?yōu)閿嗑W(wǎng)狀。MgSnGd相與α-Mg基體存在共格位向關(guān)系，能作為異質(zhì)形核核心細化合金晶粒。Mg-8Zn-1Mn-3Sn-0.5Gd合金的綜合力學性能最佳，合金力學性能得到顯著提高的機制為通過添加Gd元素細化晶粒組織、MgSnGd相釘扎晶界阻礙位錯運動以及晶界第二相形貌轉(zhuǎn)變。"/>

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微量Gd添加對Mg-8Zn-1Mn-3Sn合金組織轉(zhuǎn)變及性能的影響
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作者單位:

1.重慶大學 材料科學與工程學院，重慶 400044;2.重慶大學 國家鎂合金材料工程技術(shù)研究中心，重慶 400044

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基金項目:

高強韌鎂合金設計與大規(guī)格錠坯制備（2016YFB0301101）；重慶市科學與前沿研究技術(shù)專項項目 (cstc2019jscx-mbdxX0033)


Effect of Minor Gd Addition on Microstructure Evolution and Properties of As-cast Mg-8Zn-1Mn-3Sn Alloy
Author:
Affiliation:

1.College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2.National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China

Fund Project:

National Great Engineering Research Project of China (2016YFB0301101); Chongqing Technology Innovation and Application Development Special Project (cstc2019jscx-mbdxX0033)

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    摘要:

    研究了微量Gd的添加對Mg-8Zn-1Mn-3Sn合金顯微組織及性能的影響。結(jié)果表明，Mg-8Zn-1Mn-3Sn-xGd主要由α-Mg基體、MgZn2、Mg7Zn3、Mg2Sn相、MgSnGd相組成。MgSnGd相為高溫相，在合金凝固過程中最先形成，改變了凝固過程，使晶界處半連續(xù)第二相轉(zhuǎn)變?yōu)閿嗑W(wǎng)狀。MgSnGd相與α-Mg基體存在共格位向關(guān)系，能作為異質(zhì)形核核心細化合金晶粒。Mg-8Zn-1Mn-3Sn-0.5Gd合金的綜合力學性能最佳，合金力學性能得到顯著提高的機制為通過添加Gd元素細化晶粒組織、MgSnGd相釘扎晶界阻礙位錯運動以及晶界第二相形貌轉(zhuǎn)變。

    Abstract:

    The effect of minor Gd element on the microstructure and properties of Mg-8Zn-1Mn-3Sn alloy was studied. The results show that Mg-8Zn-1Mn-3Sn-xGd is mainly composed of α-Mg matrix, MgZn2, MgZn, Mg7Zn3, Mg2Sn phase and MgSnGd phase. The MgSnGd phase is a high temperature phase, which is formed firstly during the solidification and changes the solidification process, causing the semi-continuous second phase at the grain boundary to transform into a discontinuous network. The MgSnGd phase has a coherent orientation relationship with the α-Mg matrix, which can be used as a heterogeneous nucleation core to refine grains. The Mg-8Zn-1Mn-3Sn-0.5Gd alloy has the best comprehensive mechanical properties. The mechanical properties of the alloy are significantly improved by adding Gd elements to refine the grains, and the MgSnGd phase pins the grain boundary to hinder the movement of dislocations and the transformation of the second phase of the grain boundary.

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薛寒松,周揚,李鶴,王金陽,劉松,張丁非.微量Gd添加對Mg-8Zn-1Mn-3Sn合金組織轉(zhuǎn)變及性能的影響[J].稀有金屬材料與工程,2022,51(6):2011~2019.[Xue Hansong, Zhou Yang, Li He, Wang Jinyang, Liu Song, Zhang Dingfei. Effect of Minor Gd Addition on Microstructure Evolution and Properties of As-cast Mg-8Zn-1Mn-3Sn Alloy[J]. Rare Metal Materials and Engineering,2022,51(6):2011~2019.]
DOI：10.12442/j. issn.1002-185X.20210343

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  • 收稿日期:2021-04-19
  • 最后修改日期:2021-06-21
  • 錄用日期:2021-07-09
  • 在線發(fā)布日期: 2022-06-29
  • 出版日期: 2022-06-29