Reaction products of Al-Mg/B4C composite fabricated by pressureless infiltration technique

The interfacial reaction products of the Al/B4Cp composite fabricated by th e pressureless infiltration method were analyzed by XRD. SEM, EDS, AES, and TEM. Since the spontaneous infiltration of molten AI-Mg alloys into the po wder bed containing B4C particles occurred at 800 degreesC for 1 h under a nitrogen atmosphere. it was possible to fabricate Al-Mg alloy matrix compos ites reinforced with B,C particles. During fabrication of composites variou s reaction products were formed in the Al matrix as well as on the surface of B4C particles by the severe interfacial reaction between the Al alloy an d the B4C particles. From the SADP and CBED analysis, it could identify tha t AlB2, beta -AlB12 (Al3B48C2), AlB10 (AlB24C4), and Al3BC were formed as i nterfacial reaction products. (C) 2001 Elsevier Science B.V. All rights res erved.