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首页> 外文学位 >Development of metastable aluminum alloy coatings and parts for automotive applications.
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Development of metastable aluminum alloy coatings and parts for automotive applications.

机译：开发用于汽车的亚稳铝合金涂层和零件。

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摘要

In this study, a metastable Al-Fe-V-Si alloy powder was produced by rapid solidification using the gas atomization process. The alloy composition was chosen for its mechanical properties at elevated temperature for potential applications in internal combustion gasoline engines. The microstructural properties of the Al-Fe-V-Si powder were determined through transmission electron microscopy imaging and selected area electron diffraction indexing, energy dispersive spectroscopy, X-ray diffraction and differential scanning calorimetry. Three distinct microstructures were observed as well as two different phases, namely a Al13(Fe,V)3Si silicide phase and a metastable (Al,Si)x(Fe,V) micro-quasicrystalline icosahedral (MI) phase. The metastable MI phase was determined to be thermally stable up to 380°C, after which a phase transformation to silicide occurs. The Cold Gas Dynamic Spraying (CGDS) process was used to produce coatings of the alloy. This spray process was selected due to its relatively low operating temperature, thus preventing significant heating of the particles during spraying and as such allowing the original microstructure of the feedstock powder to be preserved within the coatings. Coatings were produced by CGDS using Helium and Nitrogen as propellant gases. The coatings microstructure was investigated using scanning electron microscopy and transmission electron microscopy analyses. The mechanical properties of the coatings were then evaluated through bond strength testing and microhardness testing.
机译：在这项研究中，通过使用气体雾化工艺快速凝固来生产亚稳的Al-Fe-V-Si合金粉末。选择合金组合物是因为其在高温下的机械性能，可用于内燃机汽油发动机中。通过透射电子显微镜成像和选择区域电子衍射指数，能量色散谱，X射线衍射和差示扫描量热法确定了Al-Fe-V-Si粉末的显微组织性能。观察到三个不同的微观结构以及两个不同的相，即Al13（Fe，V）3Si硅化物相和亚稳态（Al，Si）x（Fe，V）微准晶二十面体（MI）相。经确定，亚稳MI相在高达380°C的温度下具有热稳定性，此后发生向硅化物的相变。冷气动态喷涂（CGDS）工艺用于生产合金涂层。选择该喷涂工艺是由于其相对较低的工作温度，从而防止了喷涂过程中颗粒的明显加热，因此可以使原料粉末的原始微观结构保留在涂层中。 CGDS使用氦气和氮气作为推进剂气体生产了涂层。使用扫描电子显微镜和透射电子显微镜分析来研究涂层的微观结构。然后通过粘合强度测试和显微硬度测试评估涂层的机械性能。

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  • 作者

    Berube, Gregoire.;

  • 作者单位

    University of Ottawa (Canada).;

  • 授予单位 University of Ottawa (Canada).;
  • 学科 Engineering Automotive.;Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 2009
  • 页码 103 p.
  • 总页数 103
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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