Study on the microstructure,mechanical and corrosion behaviors of 2A12 Al matrix composites containing B 4 C and 50% K 2 TiF 6 flux

Abstract

This study presents an innovative exploration into the development and characterization of boron carbide (B₄C) reinforced aluminum (Al) metal matrix composites (AMMCs), specifically focusing on the 2A12 Al alloy. Utilizing a cutting-edge vacuum induction melting process, the research investigates the effects of varying B₄C particle concentrations in conjunction with 50% K₂TiF₆ flux additions. This novel approach aims to enhance the microstructural integrity, mechanical properties, and corrosion resistance of the AMMCs. The research unveils a significant improvement in microhardness and tensile strength with the increase of B₄C content. This enhancement is attributed to the efficient load transfer mechanism from the aluminum matrix to the B₄C phase and the thermal expansion coefficient mismatch-induced dislocations. A critical finding of this study is the uniform distribution of B₄C particles and the formation of a Ti-rich layer around these particles, facilitated by the K₂TiF₆ flux. This layer acts as a barrier, minimizing interfacial reactions. Electrochemical testing reveals that there is a slight decrease in corrosion resistance with increased B₄C content. The outcomes of this research contribute to the field of metal matrix composites, offering a path forward for the application of B₄C-reinforced AMMCs in demanding industrial environments where high strength, stiffness, and durability are critical. The study's findings open new avenues for advanced materials development in aerospace, automotive, and energy sectors.