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An Al-Mg-Si alloy matrix composite reinforced with 10% volume of alumina whiskers (Al 2 O 3 w) has been processed by powder metallurgy and investigated. The Al 2 O 3 w were produced as single crystal c-axis alpha alumina fibres at pre-pilot scale via Vapour Liquid Solid (VLS) deposition in a cold-wall airtight furnace with alumina linings. As far as we know, this is the first report of the utilization of whiskers of Al 2 O 3 as reinforcing elements for Al alloys. Tensile tests have been performed on the composite at room and high temperature. Results show that the AA6061 alloy reinforced with the as-produced Al 2 O 3 whiskers has remarkably high mechanical properties at room temperature. This is attributed to the high quality of the Al 2 O 3 single crystals and to the strong bonding attained between them and the 6061 alloy matrix.

SummaryThe effect of the microstructure on the dry sliding wear of six aluminium alloy 6061 matrix composites reinforced with 15 vol.% of MoSi 2 particles and two monolithic 6061 alloys processed by powder metallurgy with and without ball milling has been studied.

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