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首页> 外文期刊>Materials & design >Fabrication and wear characterization of an A413/Ni surface metal matrix composite fabricated via friction stir processing
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Fabrication and wear characterization of an A413/Ni surface metal matrix composite fabricated via friction stir processing

机译：摩擦搅拌法制备A413 / Ni表面金属基复合材料的制备与磨损性能

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摘要

In the present study, friction stir processing (FSP) was used for the incorporation of Ni particles into the surface of an A413 alloy to fabricate a surface composite. FSP parameters were the rotation speed of 2000 rpm, the traverse speed of 8 mm/min and the tilt angle of 2°. Single pass and three-pass FSP were conducted on the samples. For the evaluation of microstructures, optical microscopy and scanning electron microscope were utilized. Also, for the investigation of intermetallic formation, energy dispersive spectroscopy was used. The wear resistance of different composites was investigated at ambient and elevated temperatures. Microstructural observations revealed that the FSP led to significant breakup of acicular Si particles, elimination of α-Al dendrites and heal the casting porosity. It was found that the hardness and wear behavior of A413 cast alloy were strongly influenced by applying FSP.Also, the in situ formation of Al_3Ni particles during FSP was a critical factor controlling the wear mechanism. Sliding wear tests revealed that the increase in the number of passes created a homogeneous distribution of Al_3Ni intermetallic particles and thereby resulting in a significant improvement in wear resistance at both room and high temperatures.
机译：在本研究中，摩擦搅拌工艺（FSP）用于将Ni颗粒掺入A413合金的表面以制造表面复合材料。 FSP参数为2000 rpm的旋转速度，8 mm / min的移动速度和2°的倾斜角。对样品进行单程和三程FSP。为了评价微观结构，使用了光学显微镜和扫描电子显微镜。另外，为了研究金属间化合物的形成，使用了能量色散光谱法。在室温和高温下研究了不同复合材料的耐磨性。显微组织观察表明，FSP导致针状Si颗粒明显破裂，消除了α-Al枝晶并修复了铸件孔隙。研究发现，FSP对A413铸造合金的硬度和磨损行为有很大的影响。此外，FSP过程中原位形成Al_3Ni颗粒是控制磨损机理的关键因素。滑动磨损试验表明，通过次数的增加产生了Al_3Ni金属间化合物的均匀分布，从而在室温和高温下均显着提高了耐磨性。

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  • 来源
    《Materials & design》 |2015年第15期|471-482|共12页
  • 作者

    M. Golmohammadi; M. Atapour; A. Ashrafi;

  • 作者单位

    Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;

    Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;

    Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;

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

    Microstructure; Composite; Al_3Ni intermetallic; Wear behavior;

    机译：微观结构综合;Al_3Ni金属间化合物;磨损行为;

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