Scratches and Shot Peening Effects on the Fatigue Life of Aluminum-Lithium Alloys

摘要

Production of Al-Li (2090-T3) alloy by powder metallurgy results in a materialwith surfaces that contain micro and macro defects. In addition, other defects like scratches could be introduced onto the surface during processing and/or assembling with a drastic decrease in fatigue strength. In order to recover from these detrimental effects of surface defects, shot peening has been considered. Unscratched specimens were shot peened and fatigue tested. These experiments provided a stress range in which shot peening was beneficial.