20.500.12556/RUL-183282 Termodinamična karakterizacija zlitine EN AW-6082 z dodatkom Ce diplomsko delo Thermodynamic characterisation of the EN AW-6082 alloy with Ce addition diploma work Diplomsko delo obravnava vpliv dodatka cerija na aluminijevo zlitino EN AW-6082, ki spada med toplotno utrjevalne zlitine skupine 6xxx. Glavna legirna elementa te zlitine sta magnezij in silicij, ki omogočata nastanek evtektske faze Mg2Si, pomembne za utrjevanje. Namen dela je bil ugotoviti, kako dodatek cerija vpliva na fazno sestavo, potek strjevanja, fazne premene in mikrostrukturni razvoj. V raziskavi so bili primerjani trije vzorci: referenčni vzorec brez dodatka cerija, ter vzorca z dodatkom 0,1 mas. % in 0,2 mas. % Ce. Poleg termodinamičnih izračunov so analize vzorcev vključevale enostavno termično analizo, diferenčno vrstično kalorimetrijo (DSC) ter metalografsko analizo (optična in vrstična elektronska mikroskopija z EDS). Rezultati termodinamičnih izračunov so pokazali, da se cerij v aluminijevi matrici veže v dodatne intermetalne faze. Pri vzorcih z dodatkom cerija se pojavi predvsem faza AlSiCe. Hkrati lahko opazimo, da dodatek cerija ni povzročil izrazitega premika solidus in likvidus temperatur. Enostavna termična analiza ter DSC analiza sta pokazali, da imajo vsi vzorci podoben osnovni potek strjevanja in taljenja. Pri vzorcih z dodatkom cerija so bili pri določenih karakterističnih temperaturah opaženi manjši zamiki temperatur. Metalografska analiza je potrdila prisotnost primarne α-Al faze, evtektika Mg2Si, evtektika α-Al(FeMn)Si ter kvarternega evtektika sestavljenega iz: α-Al, α-Al(FeMn)Si, β-Al5FeSi in Mg2Si. V vzorcih z dodanim cerijem je bila prisotna še faza AlSiCe poliedrične oblike. This diploma thesis examines the effect of cerium addition on the aluminium alloy EN AW-6082, which belongs to the heat-treatable 6xxx series. The main alloying elements are magnesium and silicon, which enable the formation of the Mg₂Si phase, important for strengthening. The aim of the thesis was to determine how cerium addition affects the phase composition, solidification behaviour, phase transformations and microstructural development of the alloy. Three samples were compared in the study: a reference sample without cerium addition, and two samples with additions of 0.1 wt.% and 0.2 wt.% Ce. In addition to thermodynamic calculations, the analyses of the samples included simple thermal analysis, differential scanning calorimetry, and metallographic analysis (optical and scanning electron microscopy with EDS). The results of the thermodynamic calculations showed that cerium in the aluminium matrix forms additional intermetallic phases. In the samples with cerium added, the AlSiCe phase was predominantly observed. It was also found that the addition of cerium did not cause a significant shift in the solidus or liquidus temperatures. Simple thermal analysis and DSC analysis indicated that all samples exhibited similar basic solidification and melting behaviour. In the samples with cerium addition, minor shifts in some characteristic temperatures were observed. Metallographic analysis confirmed the presence of the primary α-Al phase, the Mg2Si eutectic, the α-Al(FeMn)Si eutectic and a quaternary eutectic composed of α-Al(FeMn)Si, β-Al5FeSi and Mg2Si. In the samples with added cerium, an additional polyhedral AlSiCe phase was also present. EN AW-6082 cerij Thermo-Calc DSC analiza ETA mikrostruktura AlSiCe. EN AW-6082 cerium Thermo-Calc DSC analysis simple thermal analysis microstructure AlSiCe. true false false N. Balantič Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-06-10 09:00:27 2026-06-10 09:00:34 2026-06-11 13:36:33 0000-00-00 00:00:00 2026 0 Ljubljana 0 Ljubljana XII, 36 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 113932 281320451 29400.pdf 29400.pdf 1 BE10C243CD540D6BBB3F807E14FC4342 3eab162773f21f748dfc94739c021b551f0956709deb85eef65c7905e0afd125 1116b828-649a-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=235247 Naravoslovnotehniška fakulteta 0 0 0