The sliding wear resistance behavior of NiAl and SiC particles reinforced aluminum alloy matrix composites

摘要

The sliding wear resistance behavior of NiAl and SiC particles reinforced aluminum alloy matrix composites against S45C steel was studied. Experiments were performed within a load range of 3.5 N to 82.7 N at a constant sliding velocity of 0.15 m s{sup}(-1). The sliding distance was 1000m. Two types of composites, NiAlp/Al and SiCp/Al with different volume fractions (5 vol.% and 10vol.%), were used. At low loads, where particles acted as load bearing constituents and prevented the aluminum matrix being directly involved in the wear process, the wear resistance of the SiCp/Al and the NiAlp/Al composites was superior to that of unreinforced aluminum alloy. The wear rates of SiCp/Al and 10 pct NiAlp/Al composites at 3.5 N were about one factor of 10 lower than that of aluminum alloy. With increasing applied load, the wear rates of the composites increased to levels comparable to those of unreinforced matrix alloys. At 9.4 N, the wear rates of the composites and aluminum alloy were almost the same. The wear rates of NiAlp/Al and SiCp/Al composites above 13.5 N were much lower than those of aluminum alloy, since the severe wear of aluminum alloy at higher loads was hampered by incorporating the SiC or NiAl particles into the matrix. The wear rates of the counterface material, S45C steel, worn against aluminum alloy, were lower than those worn against the SiCp/Al composites at the entire applied load range. The wear rates were increased with the volume fraction of SiC particles. The NiAlp/Al composites wore the steel at the maximum wear rate at lower loads near 5 N. The NiAl particle was easily fractured when the applied load increased; as a result, the wear rates of steel against NiAlp/Al became smaller and were almost the same as those worn against aluminum.