Abstract
The fatigue property of Al-Si powder metallurgical alloy at the elevated temperature was investigated with a special view of mesoscopic fracture analysis. Especially, the influence of difference of manufacturing process (extrusion and forging) on the fatigue property was confirmed experimentally. The main results obtained are as follows : (1) The fatigue property of Al-Si powder metallurgical alloy at the elevated temperature was mainly dominated by difference of manufacturing process. Namely, the fatigue strength of forging material was lower than that of extrusion material at the elevated temperature. (2) The lowering of fatigue strength in forging material was attributed to the breaking of a Al-Si-Fe intermetallic compound and not the debonding on the interface between Al matrix and Si particle. A intermetallic compound was shattered in the extrusion manufacturing process. In contrast, a intermetallic compound was not shattered in the forging manufacturing process. These things led to conclusions (1).
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