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首页> 外文期刊>Materials Science and Engineering >Microstructure, generation of intermetallic compounds and mechanical strengthening mechanism of as-cast Mg-4Y-xZn alloys
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Microstructure, generation of intermetallic compounds and mechanical strengthening mechanism of as-cast Mg-4Y-xZn alloys

机译：微观结构，铸造Mg-4Y-XZN合金的金属间化合物的产生和机械强化机理

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摘要

The performance of as-cast Mg-4Y-xZn (x = 1, 2, 3, and 4 wt%) alloys with adding different content of Zn is thoroughly investigated. Results show that the alloy system mainly contains Mg_(24)Y_5, Mg_(12)YZn (X), and Mg_3Y_2Zn_3 (W) phases. During the solidification process, with a Zn content of more than 1 wt%, the Mg_(24)Y_5 content gradually decreases and ultimately disappears, and the W-phase increases. The increase of Zn content account for the decrease of lattice parameters and volume of the α-Mg matrix. The yield strength and ultimate tensile strength of the Mg-4Y-xZn alloy increase with the Zn content varies from 1 to 4 wt%; the favorable values are 122 and 232 MPa. Moreover, the elongation first increases and then decreases; the optimal value is 11.9% as the Zn content reaches 3 wt%. For the alloy system, X-phase is the major strengthening phase owing to its 18R long-period stacking ordered structure; moreover, it has a crystallographic relationship of (0001)_(mg)//(001)_(18R) and [1210]_(mg)//[010]_(18R) with the Mg matrix. Indeed, the tiny W-phase can cooperate with the X-phase in order to enhance the performance of the material in question by inhibiting X-phase deformation during the tensile process. Nevertheless, if W-phase is the only second phase in the alloy, the ductility of the alloy is reduced.
机译：通过添加不同含量的Zn添加不同含量的铸造Mg-4Y-XZN（x = 1,2,3和4wt％）的性能进行了彻底研究。结果表明，合金系统主要含有Mg_（24）Y_5，Mg_（12）YZN（X）和Mg_3Y_2ZN_3（W）阶段。在凝固过程中，Zn含量超过1wt％，Mg_（24）Y_5含量逐渐降低并最终消失，并且W相增加。 Zn含量的增加对于晶格参数和α-Mg矩阵的体积减小。 Mg-4Y-XZN合金的屈服强度和极限拉伸强度随Zn含量的增加而变化为1-4wt％;有利的值是122和232MPa。而且，伸长率首先增加然后减少;随着Zn含量达到3wt％，最佳值为11.9％。对于合金系统，由于其18R长期堆叠有序结构，X相是主要的强化相位;此外，它具有（0001）_（mg）//（001）_（18r）和[1210] _（mg）// [1210] // [010] _（18r）的结晶关系，其中mg矩阵。实际上，微小的W相可以与X相配合，以通过在拉伸过程中抑制X相变形来增强所讨论的材料的性能。然而，如果W相是合金中唯一的第二相，则合金的延展性降低。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|139948.1-139948.11|共11页
  • 作者

    Huanjian Xie; Zili Liua; Xiqin Liu; Fang Liu; Yong Shi; Xinchen Wu; Jian Li;

  • 作者单位

    College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China;

    College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Jiangsu (Zhongyi) Engineering Research Center of Light Alloy Precision Die Casting Changshu 215542 China;

    College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Jiangsu (Zhongyi) Engineering Research Center of Light Alloy Precision Die Casting Changshu 215542 China;

    College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China;

    College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China;

    College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China;

    Jiangsu (Zhongyi) Engineering Research Center of Light Alloy Precision Die Casting Changshu 215542 China Jiangsu Favour Automotive New Stuff Sci-Tech Co Ltd Changshu 215542 China;

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  • 正文语种 eng
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  • 关键词

    Mg-4Y-xZn alloys; Phase composition; Microstructure; Orientation relationship; Mechanical strengthening mechanism;

    机译：Mg-4Y-XZN合金;相组成;微观结构;方向关系;机械强化机制;

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