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Diffusion welding of SiC fiber-reinforced aluminum (FRM) to aluminum was performed using insert metals of Al-Cu-Mg alloys (JIS A2017 and A2024). The faying surface of FRM was polished mechanically with emery paper or electrolytically in order to compare the diffusion weldability. The joint strength was higher for the electro polished surface than for the surface polished with emery paper. The projection of fibers from electro polished surface of FRM played an important role in the improvement of tensile and bend strength of the joint. The highest tensile strength was obtained by welding in the temperature range where 1-5vol% of liquid phase coexist with solid phase. In this case, the strengthening of aluminum matrix due to the solution of copper was observed together with the reaction of magnesium with SiC fiber.

Diffusion welding of SiC fiber-reinforced aluminum composites to aluminum.