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Microstructures and Mechanical Properties of Cu-Coated SiC Particles Reinforced AZ61 Alloy Composites

School of Materials Science and Engineering, Central South University, Changsha 410083, China
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Author to whom correspondence should be addressed.
Coatings 2019, 9(12), 820; https://doi.org/10.3390/coatings9120820
Received: 30 October 2019 / Revised: 22 November 2019 / Accepted: 25 November 2019 / Published: 3 December 2019
The pure Cu coating was plated on the surface of silicon carbide particles (SiCP) by two different methods, hydrazine hydrate direct reduction method and hydrazine with glucose pre-reduction method. The hydrazine with glucose pre-reduction method is more suitable for Cu plating on the surface of SiCP in terms of morphology and microstructure. AZ61 composites reinforced with different volume fractions (3~15%) uncoated and Cu-coated SiCP were prepared by powder metallurgy followed by hot extrusion. The effect of Cu coating on the morphology of SiCP/AZ61 composite was analyzed by optical microscope (OM), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), electronic probe micro-analyzer (EPMA) and X-ray diffractometer (XRD). The properties of the composite were characterized by Brinell hardness tester and mechanical testing machine. The effects of Cu coating on the micro-hardness, tensile strength and elongation of SiCP/AZ61 composite were analyzed. The tensile strength of AZ61 composite reinforced with Cu-coated SiCP increased by 3.5~6.3% and the elongation increased by 7.4~35.0% compared with AZ61 composite reinforced with uncoated SiCP. Therefore, the Cu coating can ameliorate the microstructure and properties of the SiCP/AZ61 composite effectively, reduce the defect rate in the composite, and improve the hardness, relative density, tensile strength, elongation of the composite. View Full-Text
Keywords: SiCP/AZ61 composite material; electroless copper plating; powder metallurgy; mechanical properties; interfacial bonding SiCP/AZ61 composite material; electroless copper plating; powder metallurgy; mechanical properties; interfacial bonding
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Dong, C.; Wang, R.; Guo, S. Microstructures and Mechanical Properties of Cu-Coated SiC Particles Reinforced AZ61 Alloy Composites. Coatings 2019, 9, 820.

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