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Nd元素对Mg-Al-Ca合金微结构以及力学性能影响的研究
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1.北京理工大学材料学院;2.重庆大学材料科学与工程学院

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Effect of Nd on microstructure and mechanical properties of Mg-Al-Ca alloy
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1.School of Materials Science and Engineering,Beijing Institute of Technology;2.College of Materials Science and Engineering,Chongqing University

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    摘要:

    本文用OM,SEM和XRD等手段研究了挤压态Mg-Al-Ca-xNd(x=0-1.76wt%)合金的显微组织和析出相以及该合金在室温和高温下的力学性能。实验结果表明,Nd的添加会使得基体中形成Al2Nd和Al11Nd3相,并且细化Mg-Al-Ca合金的晶粒。随着Nd添加量的增加,Al2Nd和Al11Nd3相的数量也随之增加。当添加1.76%Nd时,合金的平均晶粒尺寸从不含Nd的4.80μm变为2.39μm。由于第二相的析出和晶粒细化,室温下的力学性能也得到改善。随着Nd元素含量的增加,合金的室温拉伸强度由267 MPa提高到304 MPa,屈服强度从144 MPa提高到203 MPa,延伸率从20.0%下降到16.9%。在150℃时,随着Nd含量的增加,拉伸强度从192 MPa增加到229 MPa,屈服强度从140 MPa增加到159 MPa,伸长率从48.6%下降到29.3%。

    Abstract:

    The microstructures and precipitated phases of as-extruded Mg-Al-Ca-xNd alloys with 0-1.76wt.% Nd were studied by OM, SEM and XRD. The mechanical properties of the alloys at room temperature and high temperature were also tested. Experimental results showed that the addition of Nd resulted in the formation of Al2Nd and Al11Nd3phases in the matrix and the grain refinement in Mg-Al-Ca alloy, and the amounts of Al2Nd and Al11Nd3 phases increase with the increase of Nd addition. The average grain size of alloys changed from 4.80 μm without Nd to 2.39 μm when added 1.76% Nd. The mechanical properties at room temperature were improved due to the precipitation of second phases and grain refinement. With increment of Nd, the tensile strength increased from 267 MPa to 304 MPa, the yield strength increased from 144 MPa to 203 MPa and the elongation decreased from 20.0 % to 16.9% at room temperature in these alloys. At 150℃, the tensile strength increased from 192 MPa to 229 MPa, the yield strength increased from 140 MPa to 159 MPa and the elongation decreased from 48.6 % to 29.3% with increasing Nd content.

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杨东虎,陈先华,徐笑阳,赵超越. Nd元素对Mg-Al-Ca合金微结构以及力学性能影响的研究[J].稀有金属材料与工程,2020,49(1):1~9.[Donghu Yang, Xianhua Chen, Xiaoyang Xu, Chaoyue Zhao. Effect of Nd on microstructure and mechanical properties of Mg-Al-Ca alloy[J]. Rare Metal Materials and Engineering,2020,49(1):1~9.]
DOI:10.12442/j. issn.1002-185X.20180734

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  • 收稿日期:2018-07-09
  • 最后修改日期:2019-12-06
  • 录用日期:2018-10-09
  • 在线发布日期: 2020-02-16
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