EFFECT OF THE GRAIN SIZE IN THE MAGNESIUM ALLOY ZK60 ON CYCLE FATIGUE AT ROOM TEMPERATURE
AbstractIn this paper the fatigue properties were investigated in the ultrafine-grained magnesium alloy ZK60 after processing by severe plastic deformation. It was shown that the endurance limit of the material with the fine grain structure was about 160 MPa, which was approximately three times greater than that in the conventional material. The observed increase in the endurance limit is associated with the enhancement in the tensile strength and ductility reached due to deformation processing. Based on the fractography and microstructure observations one can conclude that the high cycle fatigue properties in the ZK60 Mg alloy is controlled primarily by the dislocation substructure, grain size and texture, and not by intermetallic particles.
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