In the dissertation we described the experimental methodology and findings about peening of aluminium alloy Al 7075. Two principles apply in this method - thermal treatment for aging the alloy and shot-peening with shot particles.
Our method of work is divided into three parts. In the first one we prepared the samples, treated them thermally at different temperatures and determined their optimal temperature for aging. In the second part we shot-peened the samples and determined their roughness under a microscope. In the last part we cut them, put them in bakelite and measure their stiffness. At the end we analyzed the microstructure under a microscope. After every treatment we did XRD analysis to compare the residual stresses between different treatments.
The purpose of the assignment is to determine the optimal parameters of thermal treatment for aging aluminium alloy Al 7075. We wanted to determine the effects of shot-peening of aluminium alloy on stiffness, roughness and residual stress at different methods of thermal treatment.