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首页> 外文期刊>Materials Science and Engineering >Influence of squeeze casting pressure and heat treatment on microstructure and mechanical properties of Mg_(94)Ni_2Y_4 alloy with LPSO structure
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Influence of squeeze casting pressure and heat treatment on microstructure and mechanical properties of Mg_(94)Ni_2Y_4 alloy with LPSO structure

机译：挤压铸造压力和热处理对具有LPSO结构的Mg_（94）Ni_2Y_4合金的组织和力学性能的影响

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摘要

Ternary Mg_(94)Ni_2Y_4 (at%) alloy was prepared by conventional gravity casting or direct squeezing casting and then subjected to T6 heat treatment. The influence of squeeze casting pressure and heat treatment on micro-structure evolution and mechanical properties of Mg_(94)Ni_2Y_4 alloy containing long period stacking ordered (LPSO) structure was studied. The results show that gravity cast Mg_(94)Ni_2Y_4 alloy consisted of primary ct-Mg, 18 R LPSO and eutectic structure containing a-Mg, LPSO and Mg_2Ni phases. The application of pressure cannot change phase constituents and the type of LPSO phase. With the increase of squeeze casting pressure, micro-structure was refined, the volume fraction of LPSO was decreased while that of eutectic structure was increased. Under the highest pressure of 320 MPa, kinking of LPSO phase was induced and the best mechanical properties were obtained, with the ultimate tensile strength of 250 MPa, the yield strength of 140 MPa and the elongation of 8%. They were improved by 20.2%, 22.8% and 45.5%, respectively, than those of gravity cast Mg_(94)Ni_2Y_4. After heat treatment, bulk-shaped LPSO phase transformed into rod-shaped one, but no lamellar 14 H LPSO was precipitated in the matrix. Besides, the application of squeeze casting pressure prevented LPSO from delami-nating during heat treatment.
机译：通过常规重力铸造或直接挤压铸造制备三元Mg_（94）Ni_2Y_4（at％）合金，然后进行T6热处理。研究了挤压铸造压力和热处理工艺对含有长堆积有序（LPSO）结构的Mg_（94）Ni_2Y_4合金微观组织演变和力学性能的影响。结果表明，重力铸造Mg_（94）Ni_2Y_4合金由初生ct-Mg，18 R LPSO和含α-Mg，LPSO和Mg_2Ni相的共晶组织组成。施加压力不能改变相组成和LPSO相的类型。随着挤压铸造压力的增加，微观组织得到细化，LPSO的体积分数减小，而共晶组织的体积分数增加。在320 MPa的最高压力下，诱导了LPSO相的扭结，获得了最佳的机械性能，其极限抗拉强度为250 MPa，屈服强度为140 MPa，伸长率为8％。与重力铸造的Mg_（94）Ni_2Y_4相比，它们分别提高了20.2％，22.8％和45.5％。热处理后，块状LPSO相转变为棒状一相，但在基质中没有沉淀出层状的14 H LPSO。此外，挤压浇铸压力的施加防止了LPSO在热处理过程中发生剥落。

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  • 来源
    《Materials Science and Engineering》 |2017年第7期|280-286|共7页
  • 作者

    Liangyan Hao; Xiong Yang; Shulin Lu; Xiaogang Fang; Shusen Wu;

  • 作者单位

    State Key Lab of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    State Key Lab of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    State Key Lab of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    State Key Lab of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    State Key Lab of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mg-Ni-Y alloy; LPSO structure; Squeeze casting; Heat treatment;

    机译：Mg-Ni-Y合金;LPSO结构;挤压铸造;热处理;

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