Abstract
The effect of shot peening on the fatigue strength in an artificial aged magnesium alloy AZ80 was investigated. The cast ball with an average diameter of 0.1mm was used for shot peening and the Almen intensity was set to 0.15 and 0.40mmN. The specimen surface became rough with an increase in Almen intensity. Shot peening at low Almen intensity improved the fatigue strength. However, the shot peening at high Almen intensity decreased the fatigue strength. In the specimen loaded parallel to extrusion direction, the polishing after shot peening improves the fatigue life. On the other hand, the fatigue life of the specimen loaded perpendicular to extrusion direction decreased by polishing after shot peening. This may be resulted from the difference of distribution of β phase precipitated by aging treatment.
