Abstract
The role of the collective behavior of defect ensembles at the crack tip and the laws of fatigue crack propagation in aluminum- magnesium alloy have been studied under conditions of symmetric tension–compression gigacycle loading at 20kHz using ultrasonic fatigue testing machine (Shimadzu USF2000). 3D New View 5010 interferometer profiler high resolution data of defect induced roughness in the crack process zone under fatigue crack path revealed the existence of two characteristic scales: the scale of the process zone and the correlation length that is the scale when the correlated behavior of defect induced roughness has started.
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