Abstract
Abstract This paper deals with the room temperature fatigue crack growth behaviour of a die-cast magnesium alloy AZ91D. Short and long fatigue crack growth studies were done using single edge V-notched plate specimens under pulsating tension with a stress ratio of 0.1 and a frequency of 20 Hz at different maximum applied stress levels. Retardation–acceleration in growth of short cracks was observed. The behaviour of cracks in the long crack region was also studied and the Paris constants were determined. The fracture surfaces of the tested specimens were observed under a scanning electron microscope to understand the type of fracture.
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