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IN-SITU MMC PRODUCTION THROUGH VXBY INTERMETALLICS FORMATION IN AN AL MATRIX C.Polyzos, S. Skolianos, H. Lefakis and D.N. Tsipas Aristotle University of Thessaloniki, Department of Mechanical Engineering, Physical Metallurgy Laboratory, Thessaloniki 54006, Greece, lefakis@eng.auth.gr and tsipas@eng.auth.gr (Received 9/02; accepted 2/03)
The production of in-situ MMC’s (Metal Matrix Composite) of an aluminum matrix with VxBy intermetallic compounds as the reinforcing phase has been investigated. The approach is modelled after that of Al-Ti-B alloys and salts added to an Al matrix to produce in-situ grain-refining TiB2. In the present work, V was used instead of Ti in an effort to investigate the possibility of an in-situ synthesis of a new, alternative, B-V reinforcing compound. Al, Al-V4.5wt% and Al-B5.5wt% alloys and a B-salt (KBF4) were used as starting materials. The synthesis temperature, the stirring time and the reaction holding time (RHT) were 1000oC, 5 min and 5 or 10 min respectively. The microstructure of the resulted MMC’s consisted of second-phase particles, ranging in size between 1 and 10 μm, dispersed within an Al matrix. The second phase particles were identified by X-ray diffraction (XRD) analysis as VB2 and VB. |
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