20.500.12556/RUL-176370 Vpliv homogenizacije na površino zlitine EN AW 6082 diplomsko delo Effect of homogenization on the surface of alloy EN AW 6082 diploma work Aluminij in njegove zlitine sodijo med najpomembnejše konstrukcijske materiale sodobne industrije zaradi nizke gostote, dobre korozijske obstojnosti ter širokega spektra mehanskih lastnosti, ki jih je mogoče prilagajati z izbiro legirnih elementov in ustrezno toplotno obdelavo. Mednje sodi tudi zlitina EN AW 6082 iz skupine 6XXX, katere osnovna legirna elementa sta magnezij in silicij, pogosto pa so prisotni tudi dodatki mangana, bakra, kroma ali železa. Zaradi ugodnega razmerja med trdnostjo, preoblikovalnostjo, dobro varivostjo ter možnosti anodiziranja je ta zlitina široko uporabljena v avtomobilski, letalski, gradbeni in drugih industrijah. Pomemben korak pri proizvodnji aluminijevih zlitin je homogenizacija, saj med litjem pogosto nastane kemična nehomogenost in neravnotežne mikrostrukturne sestavine, ki slabšajo mehanske lastnosti in otežujejo nadaljnjo plastično deformacijo. V diplomskem delu je bil zato proučevan vpliv temperature homogenizacije zlitine EN AW 6082 na makro- in mikrostrukturo, s posebnim poudarkom na površinskih spremembah. V okviru eksperimentalnega dela so bili izvedeni termodinamični izračuni, nato pa homogenizacija v temperaturnem območju 500–540 °C. Vzorce v litem in homogeniziranem stanju smo analizirali z diferenčno vrstično kalorimetrijo (DSC) in metalografsko preiskavo. Glavni cilj raziskave je bil ugotoviti vpliv homogenizacije na površino in ovrednotiti parametre ustrezno izvedene homogenizacije, ki omogočajo doseganje optimalnih lastnosti aluminijeve zlitine EN AW 6082. Ugotovili smo, da je za preprečevanje oksidacije površine potrebna nižja temperatura homogenizacije npr. 500 °C, pri višjih temperaturah homogenizacije je bil pojav intenzivnejši. Čas po homogenizaciji je prav tako pomemben parameter, saj se je po 85 dneh na površini povečala koncentracija magnezija. Aluminium and its alloys rank among the most important structural materials in modern industry due to their low density, good corrosion resistance, and a wide range of mechanical properties that can be tailored through the selection of alloying elements and appropriate heat treatment. Among them is the EN AW 6082 alloy from the 6XXX series, whose primary alloying elements are magnesium and silicon, though additions of manganese, copper, chromium, or iron are also often present. Thanks to its favourable balance of strength, formability, good weldability, and the possibility of anodizing, this alloy is widely used in the automotive, aerospace, construction, and other industries. An important step in the production of aluminium alloys is homogenization, as casting often results in chemical inhomogeneity and non-equilibrium microstructural constituents that impair mechanical properties and hinder further plastic deformation. Therefore, this thesis investigated the effect of homogenization temperature on the macro- and microstructure of the EN AW 6082 alloy, with special emphasis on surface changes. The experimental work included thermodynamic calculations followed by homogenization in the temperature range of 500–540 °C. Samples in both as-cast and homogenized states were analysed using differential scanning calorimetry (DSC) and metallographic examination. The main objective of the research was to determine the influence of homogenization on the surface and to evaluate the parameters of properly conducted homogenization that enable achieving the optimal properties of the EN AW 6082 aluminium alloy. It was found that a lower homogenization temperature, e.g. 500 °C, is required to prevent surface oxidation, as the phenomenon was more intense at higher temperatures. The time after homogenization also proved to be an important parameter, since after 85 days an increased concentration of magnesium was detected on the surface. Zlitina EN AW 6082 homogenizacija termodinamika oksidacija površine. EN AW 6082 alloy homogenization thermodynamics surface oxidation. true false false J. Nekrep Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-11-28 09:00:09 2025-11-28 09:00:19 2025-12-20 04:08:14 0000-00-00 00:00:00 2025 0 Ljubljana 0 Ljubljana XI, 32 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 110843 261145347 28054.pdf 28054.pdf 1 E2806D717807241C870FB5EEAB3CB573 e375768b875bf98e4d48679b2a93b1afd725f27570e6671264b2dc043e342714 edbe760f-cc2f-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=222677 Naravoslovnotehniška fakulteta 0 0 0