Influence of heat treatment on Aluminium alloys mechanical properties

Aluminij je jedan od najzastupljenijih metala u polju strojarstva koji osim niske gustoće i visoke korozijske postojanosti ima značajna svojstva električne i toplinske vodljivosti. Problem sirovog aluminija leži u vidu niskih vrijednosti čvrstoće i tvrdoće, mehaničkih svojstava koje su presudne prilikom izrada konstrukcijskih i strojnih dijelova. Kombinacijom legiranja te različitim parametrima toplinske obrade moguće je povećati otpornost i deformabilnost aluminija. U radu su opisana svojstva aluminij i aluminijevih legura, s posebnim naglaskom na toplinsko obradive legure, te pregled postupaka ispitivanja mehaničkih svojstava. U eksperimentalnom dijelu provedena je analiza uzoraka aluminijeve legure u polaznom stanju, te nakon dvije kombinacije toplinske obrade gdje su praćene promjene mehaničkih svojstava i mikrostrukture. Komentirani su rezultati te su doneseni određeni zaključci.Aluminum is one of the most common metals in the field of mechanical engineering, which, in addition to its low density and high corrosion resistance, has significant properties of electrical and thermal conductivity. The problem of raw aluminum lies in its low values of strength and hardness, mechanical properties that are crucial when making structural and machine parts. By combining alloying and different heat treatment parameters, it is possible to increase the resistance and deformability of aluminum. The paper describes the properties of aluminum and aluminum alloys, with a special emphasis on heat-treatable alloys, and an overview of the mechanical properties testing procedures. In the experimental part, an analysis of the aluminum alloy samples was carried out in the initial state, and after two combinations of heat treatment, where changes in mechanical properties and microstructure were monitored. The results were analyzed and certain conclusions were made