Abstract
Abstract Alumina fiber (Al 2 O 3f ) and alumina particle (Al 2 O 3p ) reinforced Al–4mass%Cu alloy matrix composites (Hybrid-MMC) have been fabricated by a low pressure infiltration process. Total amount of reinforcements is fixed to be 20 vol.% and the range of the amounts of Al 2 O 3f and Al 2 O 3p is varied from 7.5 vol.% to 12.5 vol.%. When the ratio of fiber vol.% to particle vol.% is increased, the soundness of casting has improved. The Hybrid-MMC with 12.5 vol.% Al 2 O 3f and 7.5 vol.% Al 2 O 3p has better wear resistance compared with PRMMC with 20 vol.% Al 2 O 3p and FRMMC with 20 vol.% Al 2 O 3f . The excellent Hybrid-MMC is attributable to a synergy effect of Al 2 O 3 particles and Al 2 O 3 fibers having a 3-D distribution, which protects Al 2 O 3 particles from dropping out. A superior wear resistance has been observed in the MMC with an age-hardened Al–Cu matrix and another synergy effect of reinforcements and matrix is observed.
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