Abstract
High cycle fatigue tests in rotating bending loading were carried out in extruded AZ31 magnesium alloys with two kinds of grain size (about 30 mm and about 50 mm). Effects of microstructure and grain size on fatigue behaviors such as fatigue strength, crack initiation and propagation behaviors were discussed. As the results, there were no clear difference in the fatigue strength, the crack initiation and propagation behaviors in the both alloys. There showed a clear bending point in the relation between crack propagation rate da=dN and the stress intensity
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