Directed melt oxidation and nitridation in aluminium alloys: B. S. S. Daniel and V.S. R. Murthy self-sustainment of the process, addition of highly diffu kinetics of aluminium alloys nitridation. In Proceedings of sive elements(along with silicon)is essential. Compared Ceramic and Metal Matrix Composites, Ed. Mostarhaci Pergamon Press, New York, 1989, 302-311 to oxidation, nitridation is more sensitive to reaction 20 Scholz. H. and Greil. p nitridation reactions of molten AH-Mg temperature and partial pressure of the reactant gas Si)alloys, J. Mat. Sci. 1991. 26, 669-677 Further, in nitridation, a wide range of metal and 21 Scholz, H. and Greil, P. Synthesis of high purity aIN by nitrida- eramic combinations(MMC and CMC) is possible. 22 Manor, E. et al. Microstructure evolution of SiC/ALO/A! alloy While extensive studies have been carried out on t omposite formation via the DiMOX process(with and 1993,76,1771787 23 Breval. E. ef al. Structure of aluminum nitridealuminum and without filler materials), only limited research has been aluminium oxide/aluminum composites produced by the directed undertaken on nitridation. Although Al,/Al and oxidation of aluminum. J. Am. Ceram. Soc. 1993. 76, 1865 AIN/Al composites exhibit similar mechanical proper- 24 Antolin, S et al. Formation of Al; O metal composites ties, the moisture sensitivity of AIn restricts the appli directed oxidation of molten aluminum-magnesium-Si alloys: Part 1, Microstructural development. J. Am. Cerum cation of AIN/Al composite material 992.75.147-154 25 Aghajanian, M.K. et al. Fabrication of metal matrix composites by a pressureless infiltration technique. J. Mat. Sci. 1991. 26 Acknowledgements 447-454 The authors are grateful to the board of research in Nagelberg, A.S. ef al. Formation of Al,O metal com the directed oxidation of molten aluminum-magnesium Nuclear Sciences(BRNS)for the research grant no alloys: Part Il, Growth kinetics. J. Am. Ceram. 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