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首页> 外文期刊>Materials Science and Engineering >Microstructures and mechanical properties of heat-treated Al-5.0Cu-0.5Fe squeeze cast alloys with different Mn/Fe ratio
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Microstructures and mechanical properties of heat-treated Al-5.0Cu-0.5Fe squeeze cast alloys with different Mn/Fe ratio

机译：不同Mn / Fe比热处理Al-5.0Cu-0.5Fe挤压挤压合金的组织和力学性能

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摘要

The Al-5.0wt% Cu-0.5 wt% Fe alloys with different Mn/Fe ratio were prepared by squeeze casting. Various test techniques, including tensile test, image analysis, scanning electron microscope (SEM), X-ray diffraction (XRD), electron probe micro-analyzer (EPMA) and transmission electron microscopy (TEM) were used to examine the microstructures and mechanical properties of the alloys in T5 heat-treated condition. The results show that the β-Fe (Al_7Cu_2Fe) is stable and its needle-like morphology is maintained after T5 heat treatment. However, the Chinese script Al_mFe, α-Fe or Al_6(FeMn) partially transform to a new Chinese script Cu-rich α(CuFe) (Al_7Cu_2Fe or Al_7Cu_2(FeMn)), which is harmful to the mechanical properties of the alloys due to the decrease of the Cu content in α(Al) matrix. The optimal Mn/Fe ratio is determined by the morphology of Fe-rich intermetallics, volume fraction of θ' and T (Al_(20)Cu_2Mn_3), size of α(Al) dendrite and porosity. Excessive Mn/Fe ratio will deteriorate the mechanical properties of the alloys due to the increase of the total amount of porosity and the Fe-rich intermetallics. When the Mn/Fe ratio is 1.6 and 1.2 for the applied pressure of 0 MPa and 75 MPa, respectively, the needle-like β-Fe phase is completely converted to the Chinese script Fe-rich intermetallics. The ultimate tensile strength, yield strength and elongation of the T5 heat-treated alloy with the Mn/Fe ratio of 1.2 and applied pressure of 75 MPa reach 395 MPa, 335 MPa and 14%, respectively.
机译：通过挤压铸造制备了不同Mn / Fe比的Al-5.0wt％Cu-0.5 wt％Fe合金。使用各种测试技术，包括拉伸测试，图像分析，扫描电子显微镜（SEM），X射线衍射（XRD），电子探针显微分析仪（EPMA）和透射电子显微镜（TEM）来检查显微组织和力学性能。 T5热处理条件下的合金数量。结果表明，经T5热处理后，β-Fe（Al_7Cu_2Fe）稳定，并保持针状形态。但是，中文脚本Al_mFe，α-Fe或Al_6（FeMn）部分转化为新的中文脚本富含铜的α（CuFe）（Al_7Cu_2Fe或Al_7Cu_2（FeMn）），这对合金的机械性能有害。 α（Al）基体中Cu含量的降低。 Mn / Fe的最佳比例取决于富铁金属间化合物的形貌，θ'和T的体积分数（Al_（20）Cu_2Mn_3），α（Al）枝晶的大小和孔隙率。由于孔隙率和富铁金属间化合物的总量的增加，Mn / Fe比例过大会降低合金的机械性能。当施加的压力分别为0 MPa和75 MPa时，Mn / Fe比分别为1.6和1.2时，针状β-Fe相完全转化为富铁的中文脚本金属间化合物。 Mn / Fe比为1.2且施加压力为75 MPa的T5热处理合金的极限拉伸强度，屈服强度和伸长率分别达到395 MPa，335 MPa和14％。

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  • 来源
    《Materials Science and Engineering》 |2013年第20期|366-375|共10页
  • 作者

    Weiwen Zhang; Bo Lin; Jianlei Fan; Datong Zhang; Yuanyuan Li;

  • 作者单位

    School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;

    School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;

    School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;

    School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;

    School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;

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  • 正文语种 eng
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  • 关键词

    Squeeze casting; Fe-rich intermetallics; Microstructures; Mechanical properties; Mn/Fe ratio;

    机译：挤压铸造;富铁金属间化合物;微观结构;机械性能锰铁比;

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