Abstract
In order to investigate the formation of AlN, mechanical alloying was carried out in <TEX>$N_2$</TEX> and <TEX>$NH_3$</TEX> atmosphere. Differential thermal analysis (DTA), x-ray diffraction (XRD) and chemical analysis were carried out to examine the formation behavior of aluminum nitrides. No diffraction pattern of AlN was observed in XRD analysis of the as-milled powders in <TEX>$NH_3\;or\;N_2$</TEX> atmosphere. However, DTA and chemical analysis indicated that the precursors for AlN were formed in the Al powders milled in <TEX>$NH_3$</TEX> atmosphere. The AlN precursors transformed to AlN after heat treatment at and above <TEX>$600^{\circ}C$</TEX>. It was considered that the reaction between Al and <TEX>$NH_3$</TEX> was possible by the formation of fresh Al surface during mechanical alloying of Al powders.
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