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首页> 外文期刊>Materials Science and Engineering >Preparation of hybrid particulates SiC_(np) and Mg_2Si reinforced Al-Cu matrix composites
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Preparation of hybrid particulates SiC_(np) and Mg_2Si reinforced Al-Cu matrix composites

机译：混杂颗粒SiC_（np）和Mg_2Si增强的Al-Cu基复合材料的制备

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摘要

In this study, a new type of external added nano-sized SiC particles (SiCnp for short) and in-situ Mg2Si particles reinforced composites, i.e. (1.5 wt% Mg2Si + 1 wt% SiCnp)/Al-Cu composites, has been successfully prepared for the first time, and the microstructure and mechanical properties of the composites are studied. The eutectic Mg2Si phase in the Mg2Si/AI-Cu composites is refined from short strip with length of about 10 mu m to dot shape with diameter of about 2 mu m in (Mg2Si + SiCnp)/Al-Cu composites, which is uniformly distributed inside Al2Cu phases precipitated at the grain boundary. The alpha-Al grains are also significantly refined. It is also first discovered that SiCnp can act as nucleus of Mg2Si, or be captured by the Mg2Si phase during solidification, which promotes the heterogeneous nucleation of the eutectic Mg2Si phase to reduce the size of Mg2Si phase. The ultimate tensile strength (UTS) and yield strength of (Mg2Si + SiCnp)/Al-Cu composites are 325 MPa and 210 MPa, which are 3.2% and 28.8% higher than those of Mg2Si/AI-Cu composites, respectively. These properties are also improved by 20.4% and 21.4% respectively compared with SiCnp/Al-Cu composites, while (Mg2Si + SiCnp)/Al-Cu composites maintain good ductility.
机译：在这项研究中，一种新型的外部添加的纳米级SiC颗粒（简称SiCnp）和原位Mg2Si颗粒增强复合材料，即（1.5 wt％Mg2Si + 1 wt％SiCnp）/ Al-Cu复合材料，已经成功地获得了成功。首次制备，研究了复合材料的微观结构和力学性能。在（Mg2Si + SiCnp）/ Al-Cu复合材料中，Mg2Si / Al-Cu复合材料中的共晶Mg2Si相从长度约10μm的短条细化为直径约2μm的点状，均匀分布内部Al2Cu相沉淀在晶界处。 α-Al晶粒也得到了明显的细化。还首先发现SiCnp可以充当Mg2Si的核，或在凝固过程中被Mg2Si相捕获，这促进了共晶Mg2Si相的异相成核，从而减小了Mg2Si相的尺寸。 （Mg2Si + SiCnp）/ Al-Cu复合材料的极限拉伸强度（UTS）和屈服强度分别为325 MPa和210 MPa，分别比Mg2Si / Al-Cu复合材料高3.2％和28.8％。与SiCnp / Al-Cu复合材料相比，这些性能也分别提高了20.4％和21.4％，而（Mg2Si + SiCnp）/ Al-Cu复合材料保持了良好的延展性。

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  • 来源
    《Materials Science and Engineering》 |2019年第28期|107-114|共8页
  • 作者

    Li Jianyu; Zhao Gaozhan; Wu Shusen; Huang Zhiwei; Lu Shulin; Chen Qiang; Li Fei;

  • 作者单位

    Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China;

    Southwest Tech & Engn Inst, Chongqing 400039, Peoples R China;

    Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China;

    Southwest Tech & Engn Inst, Chongqing 400039, Peoples R China;

    Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China;

    Southwest Tech & Engn Inst, Chongqing 400039, Peoples R China;

    Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Metal matrix composites; Al-Cu matrix; Hybrid reinforcement; Mechanical properties;

    机译：金属基复合材料;铝铜基复合材料;增强筋;力学性能;

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