Simulation and Experimental Study on Surface Mechanical Attrition Treatment for Surface Roughness of 7075 Aluminum Alloys

Abstract

This paper presents the effects of surface mechanical attrition treatment (SMAT) for the roughness of Aluminum specimens with three kinds of steel media that have different diameters (1.2[Formula: see text]mm, 1.5[Formula: see text]mm, and 2.4[Formula: see text]mm). First, experiments with SMAT for aluminum materials with a short time of 10[Formula: see text]s were performed, then a single-ball impact model was developed to find out the velocity of balls in the chamber. Next, a multi-ball model with the determined velocity was built. Finally, a comparison of the surface roughness was conducted between the experiment and simulation results. The results reveal that when the shot time and media size increase, the surface roughness value rises significantly in both experiment and simulation studies.