Abstract
Abstract The tribological behavior of sintered aluminum metal matrix composites (MMCs) containing various volume fractions of particles made of complex metallic alloys (CMAs) was investigated in a reciprocating dry sliding tribo-tester operated in ambient air against 10 mm diameter Al2O3 balls. The Al-based MMCs tested contained either 15 μm size AlCuFeB or 25 μm size AlCuFeCr-particles. An improvement in the dry sliding wear resistance of aluminum was achieved by the incorporation of these CMA-particles acting as a second phase reinforcement. The wear resistance depends on the volume fraction of CMA-particles but not on their composition, nano-hardness or size. These Al-based MMCs containing CMA-particles exhibit however a higher coefficient of friction than pure aluminum under dry sliding against a ceramic counterbody. A clear correlation was not found between composition, nano-hardness, size or volume percent of CMA-particles, and coefficient of friction. The dominant wear mechanisms active on MMCs containing either AlCuFeB or AlCuFeCr-particles are abrasion and adhesion, but abrasion dominates in the case of Al-MMCs containing AlCuFeCr-particles.
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