Abstract
Particulate-reinforced aluminum alloy composites, using NiAl intermetallic compound and SiC ceramic particles as the reinforcement phase, were fabricated by a die-casting method. Through high cycle fatigue tests, the fatigue strength of composite materials in the as cast condition was investigated at room and elevated temperatures of 200°C and 300°C. Fatigue strengths of each material gradually decreased with increase of temperature. Composite materials showed a higher fatigue limit, as compared with that of the matrix Al alloy within the tested temperature range. The NiAl particle reinforced material showed a good fatigue limit up to 200°C. At 300°C, the fatigue strength was dominated by the matrix strength. It was found that these fatigue behaviors were associated with the fracture surface observations.
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