Effect of Stress Field around interface Edge on Fatigue Strength of Aluminium Cast Alloy Locally Reinforced by SiC and Al_2O_3

摘要

To contribute to a better understanding of the fracture mechanisms, stress distributions and cyclic fatigue fracture behavior of an aluminum cast alloy locally reinforced by SiC particles and Al_2O_3 whiskers a four-point bending test was precisely analyzed experimentally. Aluminum cast alloy locally reinforced by SiC particles and Al_2O_3 whiskers was cyclically deformed to failure at room temperature under stress-amplitude controlled condition. The fracture mechanism and the fracture path has been investigated on the fracture surfaces. Crack initiation locations and fracture surface morphologies have also been investigated. SEM analysis of the fracture surface showed that the fatigue fracture was controlled by fracture of reinforcing particles and whiskers.