Reaction products of Al–Mg/B 4C composite fabricated by pressureless infiltration technique

Abstract

The interfacial reaction products of the Al/B 4C p composite fabricated by the pressureless infiltration method were analyzed by XRD, SEM, EDS, AES, and TEM. Since the spontaneous infiltration of molten Al–Mg alloys into the powder bed containing B 4C particles occurred at 800°C for 1 h under a nitrogen atmosphere, it was possible to fabricate Al–Mg alloy matrix composites reinforced with B 4C particles. During fabrication of composites various reaction products were formed in the Al matrix as well as on the surface of B 4C particles by the severe interfacial reaction between the Al alloy and the B 4C particles. From the SADP and CBED analysis, it could identify that AlB 2, β-AlB 12 (Al 3B 48C 2), AlB 10 (AlB 24C 4), and Al 3BC were formed as interfacial reaction products.