Abstract
In the present work, Al-AlN metal matrix composite is synthesized by liquid metallurgy route. AlN particles are difficult to wet by molten Al because of their sinking tendency due to higher specific gravity. To retain them in a matrix for more time, it is attempted to add sintered powder compacts of Al and AlN into the Al melt at 1173 K using the vortex method. For the conceptual interfacial study of matrix and reinforcement, separate batches of Al-AlN composites with and without Mg are synthesized. The angle formed by particulate with matrix was studied to understand the bonding between them. Interfacial angle measurement indicates the improvement in the bonding of AlN particulates in Al matrix. Hardness is improved by 52% and specific wear rate reduced by 37% for Mg-modified Al-AlN composite than unmodified Al-AlN.
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