Influence of heating temperature and holding time on the hardness of magnesium and silicon based aluminium alloy

U ovom završnom radu navedena su neka opća svojstva aluminija i njegovih legura. Posebna pažnja posvećena je leguri 6063 (leguri aluminija na bazi silicija i magnezija) i njenoj toplinskoj obradi. Najviše je analiziran utjecaju temperature zagrijavanja i vremena držanja na njenu tvrdoću. Iz navedene legure izrađeno je 6 uzoraka, te su neki umjetno dozrijevani na različitim temperaturama i vremenima držanja, a neki su prirodno dozrijevani. Nakon toga svim uzorcima izmjerena je tvrdoću i analizirana mikrostruktura. Došlo se do zaključka koji omjer temperature i vremena držanja rezultira najvećom tvrdoćom, te koji bi omjer bio najekonomičniji.In this bachelor thesis, some general properties of aluminum and its alloys are listed. Special attention was paid to alloy 6063 ( aluminum alloy based on silicon and magnesium) and its heat treatment. The focus was mostly on the influence of heating temperature and holding time on its hardness. 6 specimens from mentioned alloy were maid and then some of them artificially aged at different temperatures and holding time, and some of them aged naturally. The specimen hardness was measured and also microstructure was analysed. The conclusion was about ratio of temperature and holding time that results in the highest hardness, and which ratio would be most economical