Characterization of Surface Strengthening Layer of 7A52 Aluminum Alloy by Supersonic Shot Peening and its Tribological Prop
To improve its surface global performance, 7A52 aluminum alloy was treated by means of supersonic shot peening, then the structure of surface strengthening layer was characterized and its tribological properties were investigated, too. It was found that after having been peened, surface hardness of 7A52 aluminum alloy increased by 80%, surface crystalline grains were refined, a surface compression stress layer with thickness of 320μm was fabricated, which reached maximum 210MPa at the distance of 80~100μm from the top treated surface; The alloy performs superb tribological properties under both unlubrication friction and lubrication friction.
Xianghua Liu, Zhengyi Jiang and Jingtao Han
J. W. He et al., "Characterization of Surface Strengthening Layer of 7A52 Aluminum Alloy by Supersonic Shot Peening and its Tribological Prop", Advanced Materials Research, Vols. 148-149, pp. 1177-1181, 2011