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Influence of Sc on microstructure and mechanical properties of Al-Si-Mg-Cu-Zr alloy

机译：Sc对Al-Si-Mg-Cu-Zr合金组织和力学性能的影响

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摘要

In the present study, the effects of Mg, Cu, Sc and Zr combined additions on the microstructure and mechanical properties of hypoeutectic Al-Si cast alloy were systematically investigated. Characterization techniques such as optical microscopy (OM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), electron back-scatter diffraction (EBSD), atomic force microscopy (AFM), transmission electron microscope (TEM), Brinell hardness tester and universal testing machine were employed to analyze the microstructure and mechanical properties. The results showed that Sc served as modifier on the microstructure of Al-3Si-0.45Mg-0.45Cu-0.2Zr alloys, including modification of eutectic Si and grains. Extraordinarily, grain refinement was found to be related to the primary particles, which exhibited a close orientation to matrix. After T6 heat treatment, the grain structures were composed of nano-scaled secondary Al-3(Sc, Zr) precipitates and spherical eutectic Si. Combined with T6 heat treatment, the highest hardness, yield strength, ultimate tensile strength and elongation were achieved in 0.56 wt.% Sc-modified alloy. Interestingly, the strength and ductility had a similar tendency. This paper demonstrated that combined additions of Mg, Cu, Sc and Zr could significantly improve the microstructure and performance of the hypoeutectic Al-Si cast alloy.
机译：在本研究中，系统地研究了Mg，Cu，Sc和Zr组合添加对次共晶Al-Si铸造合金的组织和力学性能的影响。表征技术包括光学显微镜（OM），扫描电子显微镜（SEM），能量色散光谱仪（EDS），电子背散射衍射（EBSD），原子力显微镜（AFM），透射电子显微镜（TEM），布氏硬度计用万能试验机分析组织和力学性能。结果表明，Sc对Al-3Si-0.45Mg-0.45Cu-0.2Zr合金的显微组织起到了改性作用，包括共晶Si和晶粒的改性。异常地，发现晶粒细化与初级颗粒有关，初级颗粒表现出与基质的紧密取向。 T6热处理后，晶粒结构由纳米级次生Al-3（Sc，Zr）沉淀和球形共晶Si组成。结合T6热处理，可以在0.56 wt。％的Sc改性合金中获得最高的硬度，屈服强度，极限抗拉强度和伸长率。有趣的是，强度和延展性具有相似的趋势。本文证明，Mg，Cu，Sc和Zr的组合添加可以显着改善亚共晶Al-Si铸造合金的组织和性能。

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  • 来源
    《Applied Physics》 |2018年第2期|144.1-144.11|共11页
  • 作者

    Li Yukun; Du Xiaodong; Zhang Ya; Zhang Zhen; Fu Junwei; Zhou Shiang; Wu Yucheng;

  • 作者单位

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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