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V diplomski nalogi so opisane metode eksperimentov in ugotovitve pri utrjevanju materiala Al 7075. Pri tem se uporabi dva principa, toplotno obdelavo s staranjem zlitine in udarno utrjevanje s kovinskimi kroglicami. Našo metodo dela bi lahko v grobem razdelili na tri dele. V prvem delu smo pripravili vzorce, jih toplotno obdelali pri različnih temperaturah in določili optimalno temperaturo staranja. V drugem delu smo vzorce udarno utrjevali in jim z mikroskopom določili hrapavost. V zadnjem delu pa smo vzorce razrezali, jih vložili v bakelit in jim izmerili trdoto po globini. Na koncu smo z mikroskopom analizirali nastalo mikrostrukturo. Po vsaki obdelavi smo tudi opravili XRD analizo, s katero smo lahko primerjali nastale zaostale napetosti pri različnih postopkih. Cilj in namen diplomske naloge je ugotoviti, kakšni so optimalni parametri toplotne obdelave in staranja aluminijeve zlitine Al7075. Hoteli smo tudi ugotoviti, kakšen vpliv na trdoto, hrapavost in zaostale napetosti ima udarno utrjevanje aluminijeve zlitine pri različnih toplotnih obdelavah. 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.