Microstructures and mechanical properties of in-situ CaB6 ceramic particles reinforced Al-Cu-Mn composite

摘要

The properties of reinforcing particles, preparation technology and interfacial bonding between reinforcing particles and the matrix are crucial factors affecting the properties of particle-reinforced composites. In this paper, in-situ CaB6 nanoparticles were prepared by melt-spinning and CaB6/Al-Cu-Mn nanocomposites with uniform distribution of reinforcing particles in the matrix were prepared with the aid of ultrasonic vibration. The effects of CaB6 amounts on the microstructure and properties of the composites were studied. The distribution of CaB6 particles in the matrix was analyzed by SEM. The results indicated that the dispersibility of CaB6 nanoparticles in 1 vol.% and 2 vol.% CaB6/Al-Cu-Mn nanocomposites was better than that in 3 vol.% CaB6/Al-Cu-Mn nanocomposites. The CaB6/Al interface was studied by HRTEM and first-principles calculation. The results indicated that CaB6 and alpha-Al could form a coherent interface, and the interfacial energies of the CaB6/Al interfaces were very low. The CaB6 particles significantly improved the room and high temperature properties of the Al-Cu-Mn alloy.