Abstract
SEM servo analysis using in-situ observation on a fatigue mechanism at elevated temperature was carried out. The main results were as follows. (1) An Al-Si powdered alloy exhibits superior fatigue property at elevated temperature. Namely, the fatigue strength ratio, that is the ratio of the fatigue strength to the tensile strength, at 200°C is higher than that at room temperature. The fatigue limit of an Al-Si powdered alloy at 200°C and room temperature isn't recognized. (2) The crack initiation life of an Al-Si powdered alloy represented the majority of the total fatigue life. The fatigue crack was initiated by the debonding on the interface between the Al matrix and Si particle. (3) The transition condition from fatigue to brittle fracture was determined by Griffith criterion. The load energy was spent to surface energy due to the debonding when mesocracks grew to critical crack length of about 200 μm following the final brittle failure.
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