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首页> 外文期刊>Materials Science and Engineering >Fabrication of aluminum-alumina metal matrix composites via cold gas dynamic spraying at low pressure followed by friction stir processing
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Fabrication of aluminum-alumina metal matrix composites via cold gas dynamic spraying at low pressure followed by friction stir processing

机译：低压冷气体动态喷涂，然后进行摩擦搅拌工艺制备铝-氧化铝金属基复合材料

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摘要

Cold gas dynamic spraying at low pressure (1 MPa gage or 150 psig) was used to fabricate Al-Al_2O_3 metal matrix composite (MMC) coatings onto 6061 Al alloy. The powder contained Al powder admixed with -10 μm Al_2O_3 in fractions up to 90wt.%. Scanning electron microscopy (SEM), Vickers micro-hardness testing, and image analysis were conducted to determine the microstructure, properties, and volume fraction of reinforcing particles in the coatings. The coatings were then friction-stir processed (FSP) at tool rotation speeds of 894 or 1723 RPM using a flat cylindrical tool. The Al_2O_3 content and hardness of the final MMC coatings increased with increasing fractions of Al_2O_3 particles in the feedstock powder, resulting in a maximum Al_2O_3 content of 48 wt.% and a hardness of 85 HV of the as-sprayed coating when 90 wt.% Al_2O_3 was used in the feed powder blend. After FSP, the hardness of the MMC increased to a maximum of 137 HV. The as-sprayed coatings contained Al_2O_3 particles that were segregated between the Al particles, and FSP was effective in dispersing these Al_2O_3 particles and decreasing their mean free path. It was suggested that this re-distribution and Al_2O_3 particle size refinement during FSP improved the hardness of the MMC coatings.
机译：使用低压（1 MPa表压或150 psig表压）冷气动态喷涂在6061铝合金上制造Al-Al_2O_3金属基复合材料（MMC）涂层。该粉末包含以至多90wt。％的比例混合有-10μmAl_2O_3的Al粉末。进行扫描电子显微镜（SEM），维氏显微硬度测试和图像分析，以确定涂层中增强颗粒的微观结构，性能和体积分数。然后使用扁平圆柱形工具以894或1723 RPM的工具旋转速度对涂层进行摩擦搅拌处理（FSP）。最终MMC涂层的Al_2O_3含量和硬度随原料粉末中Al_2O_3颗粒分数的增加而增加，导致最大Al_2O_3含量为48 wt。％，喷涂后涂层的硬度为85 HV，当含量为90 wt。％时饲料粉末混合物中使用了Al_2O_3。 FSP后，MMC的硬度增加到最大137 HV。喷涂后的涂层包含Al_2O_3颗粒，这些颗粒被隔离在Al颗粒之间，FSP可以有效地分散这些Al_2O_3颗粒并降低其平均自由程。有人认为，在FSP过程中这种重新分布和Al_2O_3粒度的细化提高了MMC涂层的硬度。

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  • 来源
    《Materials Science and Engineering》 |2012年第30期|p.114-121|共8页
  • 作者

    K.J. Hodder; H. Izadi; A.G. McDonald; A.P. Gerlich;

  • 作者单位

    Department of Chemical and Materials Engineering, University of Alberta, 7th Floor, Electrical & Computer Engineering Research Facility, Edmonton, Alberta, Canada T6C 2V4;

    Department of Chemical and Materials Engineering, University of Alberta, 7th Floor, Electrical & Computer Engineering Research Facility, Edmonton, Alberta, Canada T6C 2V4;

    Department of Mechanical Engineering, University of Alberta, 4-9 Mechanical Engineering Building, Edmonton, Alberta, Canada T6C 2C8;

    Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3C1;

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  • 正文语种 eng
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  • 关键词

    aluminum; alumina; cold spraying; hardness; mean free path; metal matrix composites;

    机译：铝;氧化铝冷喷涂;硬度;平均自由路径;金属基复合材料;

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