Optimization of cold-sprayed AA2024/Al2O3 metal matrix composites via friction stir processing: Effect of rotation speeds
作者： Kang Yang , Wenya Li , Chunjie Huang , Xiawei Yang , Yaxin Xu
DOI: 10.1016/J.JMST.2018.03.016
关键词:
摘要: Abstract In this study, friction stir processing (FSP) was employed to modify cold-sprayed (CSed) AA2024/Al2O3 metal matrix composites (MMCs). Three different rotation speeds with a constant traverse speed were used for FSP. Microstructural analysis of the FSPed specimens reveals significant Al2O3 particle refinement and improved distribution over as-sprayed deposits. After FSP, microstructural mechanical gradient MMC through thickness direction obtained. Therefore, hybrid technique combining these two solid-state processes, i.e. CS proposed produce functionally The Guinier-Preston-Bagaryatskii zone dissolved during while amounts at approximately same, which is possibly due excellent thermal conductivity Cu substrate. Mechanical property tests confirm that FSP can effectively improve tensile performance Vickers hardness CSed MMCs. properties be further enhanced larger maximum increase 25.9% in ultimate strength 27.4% elongation 1500 rpm. Friction show decreases wear resistance MMCs deposits breakup particles. average values fluctuations coefficients vary significantly.
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