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Al和Li含量不同的时效态Mg-Gd-Zn-Zr-Ag合金的组织和力学性能
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重庆大学 轻合金国际联合实验室教育部

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国家重点研发项目(2016YFB0301100);国家自然科学基金(51571043);中央高校基础研究基金(2018CDJDCL0019、cqu2018CDHB1A08、2018CDGFCL0005)


Microstructure and mechanical properties of as-aged Mg-Gd-Zn-Zr-Ag alloy with different contents of Al and Li
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The National Key Technologies R&D Program of China;National Natural Science Foundation of China ;Fundamental Research Funds for the Central Universities

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    摘要:

    研究了不同铝和锂元素含量的Mg-12Gd-1Zn-0.5Zr-0.5Ag (wt.%)合金经T6热处理后的组织演变和力学性能。结果表明, T6热处理后,有新的Mg3Gd颗粒从Mg-12Gd-1Zn-0.5Zr-0.5Ag合金中析出,且 Mg-12Gd-4Al-3Li-1Zn-0.5Zr-0.5Ag 和 Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag合金中的大多数Al2Li3相变得更细小,分布更均匀。时效态Mg-12Gd-4Al-3Li-1Zn-0.5Zr-0.5Ag 和 Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag合金中的晶粒尺寸和c/a比值相比时效态Mg-12Gd-1Zn-0.5Zr-0.5Ag alloy有显著的降低,这有利于提高抗拉强度和塑性。时效态Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag合金结合了最佳的拉伸强度、弹性模量和塑性,其拉伸强度为210 MPa,弹性模量为50.7 GPa,延性率为24.8%。

    Abstract:

    In this work,the microstructure evolution and mechanical properties of Mg-12Gd-1Zn-0.5Zr-0.5Ag (in wt.%) alloys with different contents of Al and Li elements by T6 heat treatment were investigated. The results indicate that new Mg3Gd particles are precipitated in Mg-12Gd-1Zn-0.5Zr-0.5Ag alloy and most Al2Li3 phases in Mg-12Gd-4Al-3Li-1Zn-0.5Zr-0.5Ag and Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag alloys become smaller and more evenly distributed after T6 heat treatment. The grain size and c/a ratio values of the as-aged Mg-12Gd-4Al-3Li-1Zn-0.5Zr-0.5Ag alloy and Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag alloy are decreased significantly than that of as-aged Mg-12Gd-1Zn-0.5Zr-0.5Ag alloy, which results in improved tensile strength and plasticity. The best combination of tensile strength, elastic modulus and plasticity is as-aged Mg-12Gd-6Al-5Li-1Zn-0.5Zr-0.5Ag alloy, the ultimate tensile strength, modulus and ductility are 210 MPa, 50.7 GPa and 24.8%, respectively.

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涂 腾,陈先华,张利娟,赵超越,罗 铸,代 言,潘复生. Al和Li含量不同的时效态Mg-Gd-Zn-Zr-Ag合金的组织和力学性能[J].稀有金属材料与工程,2021,50(2):488~496.[Tu Teng, Chen Xianhua, Zhang Lijuan, Zhao Chaoyue, Luo Zhu, Dai Yan, Pan Fusheng. Microstructure and mechanical properties of as-aged Mg-Gd-Zn-Zr-Ag alloy with different contents of Al and Li[J]. Rare Metal Materials and Engineering,2021,50(2):488~496.]
DOI:10.12442/j. issn.1002-185X.20200064

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  • 收稿日期:2020-02-04
  • 最后修改日期:2020-05-11
  • 录用日期:2020-05-27
  • 在线发布日期: 2021-03-09
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