Abstract
Al2O3 particles could be formed by a thermit reaction in an Al-12Si-4Mg-1.5Cu/Al2O3 composite due to thein-situ reaction between Al-12Si-4Mg-(1.5Cu) molten metal and SiO2 particles in preform, which took place at 1173 K for 24 hours, resulting in the decomposition of SiO2 particles and the formation of Al2O3 particles simultaneously. The mechanically mixed layers (MMLs) consisting of α-Fe and Fe oxides existed on the subsurface layers beneath the worn surface in composites or mother alloys, which improved the wear resistance. The characteristics of wear resistance and hardening of an Al-12Si-4Mg-1.5Cu/Al2O3 composite are superior to those of the Al-12Si-4Mg/Al2O3 composite and Al-12Si-4Mg-1.5Cu alloy.
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