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Friction Stir Processing of Copper-Coated SiC Particulate-Reinforced Aluminum Matrix Composite

Advanced Institute of Manufacturing with High-Tech Innovations (AIM-HI), Department of Mechanical Engineering, National Chung-Cheng University, Chia-Yi 62102, Taiwan
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Materials 2018, 11(4), 599; https://doi.org/10.3390/ma11040599
Received: 18 March 2018 / Revised: 10 April 2018 / Accepted: 11 April 2018 / Published: 13 April 2018
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Abstract

In the present work, we proposed a novel friction stir processing (FSP) to produce a locally reinforced aluminum matrix composite (AMC) by stirring copper-coated SiC particulate reinforcement into Al6061 alloy matrix. Electroless-plating process was applied to deposit the copper surface coating on the SiC particulate reinforcement for the purpose of improving the interfacial adhesion between SiC particles and Al matrix. The core-shell SiC structure provides a layer for the atomic diffusion between aluminum and copper to enhance the cohesion between reinforcing particles and matrix on one hand, the dispersion of fine copper in the Al matrix during FSP provides further dispersive strengthening and solid solution strengthening, on the other hand. Hardness distribution and tensile results across the stir zone validated the novel concept in improving the mechanical properties of AMC that was realized via FSP. Optical microscope (OM) and Transmission Electron Microscopy (TEM) investigations were conducted to investigate the microstructure. Energy dispersive spectrometer (EDS), electron probe micro-analyzer (EPMA), and X-ray diffraction (XRD) were explored to analyze the atomic inter-diffusion and the formation of intermetallic at interface. The possible strengthening mechanisms of the AMC containing Cu-coated SiC particulate reinforcement were interpreted. The concept of strengthening developed in this work may open a new way of fabricating of particulate reinforced metal matrix composites. View Full-Text
Keywords: friction stir processing (FSP); aluminum matrix composites (AMCs); core-shell SiC/Cu particulate reinforcement; intermetallic compounds (IMCs); dispersion strengthening mechanisms friction stir processing (FSP); aluminum matrix composites (AMCs); core-shell SiC/Cu particulate reinforcement; intermetallic compounds (IMCs); dispersion strengthening mechanisms
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Huang, C.-W.; Aoh, J.-N. Friction Stir Processing of Copper-Coated SiC Particulate-Reinforced Aluminum Matrix Composite. Materials 2018, 11, 599.

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