Effects of Cu@rGo Additions on Microstructure and Properties of 6061 Aluminum Matrix Composites
Graphene-reinforced 6061 aluminum matrix composites with different Cu@rGo additions were prepared by spark plasma sintering(SPS).The effects of different Cu@rGo additions on the microstructure and mechanical properties of Cu@rGo/6061Al composites were discussed.The microhardness and tensile properties of the specimens were tested using a Vickers microhardness tester and an electronic universal testing machine.The microscopic morphologies of the fractures of the samples were observed using a scanning electron microscope(SEM).The results show that the addition of Cu@rGo sig-nificantly improves the yield strength and tensile strength of Cu@rGo/6061Al composites compared to the 6061 Al matrix.However,the elongation first increases and then decreases with the increase of Cu@rGo additions.The tensile fracture morphologies also show that with the increase of Cu@rGo additions,the tearing edges decreases,and the dimple structure gradually transitions from small and deep to large and shallow.It shows that the plasticity of the composites gradually deterio-rates.The comprehensive analysis shows that when the Cu@rGo additions are 0.05wt%and 0.1wt%,the comprehensive properties of the Cu@rGo/6061Al composites are better,and the tensile strength and elongation are significantly improved compared with the 6061 aluminum alloy substrate.
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