The influence of mechanical surface treatments on fatigue behavior of extruded AZ61 magnesium alloy

摘要: Abstract Surface treatments such as shot peening which introduce compressive residual stresses into the near surface region can have a beneficial effect on fatigue behavior. In present study, tension-compression tests were carried out to understand influence of three different mechanical properties extruded AZ61 magnesium alloy at stress ratio −1 and frequency 20 Hz under ambient environment. The used in study were: (a) peening, (b) micro-peening (c) barrel processing. It was found that strength shot-peened specimens actually degraded by about 30% compared had not been peened. peened cracks nucleated induced defects then propagated failure, direct indication shot-peening able offset detrimental process-induced high roughness defects. On other hand, both micro-peened processed exhibited an improvement 15%. these latter two instances, even though sites specimen roughness, retarded crack propagation, thereby resulting observed strength.