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Termodinamična karakterizacija Al zlitine Silafont-36
Rudolf, Karlo (Author), Vončina, Maja (Mentor) More about this mentor... This link opens in a new window

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Abstract
Med kovinami je aluminij eden od najpogostejših materialov, ki ga uporabljamo v različnih aplikacijah. Za doseganje željenih lastnosti materiala na osnovi aluminija, dodajamo določene legirne elemente, kot so Cu, Mg, Si, Mn, Zn, Fe itd. Silicij izboljša livnost, poveča odpornost proti obrabi. Mangan (tudi do 0,6 mas. %) onemogoči tvorbo ne zaželjene faze β-Al5FeSi, ki je igličaste oblike in povzroča zarezni učinek ter slabše mehanske in korozijske lastnosti. Za zmanjšanje evtektskega β-Si se običajno dodaja modifikator Na in/ali Sr, fosfor pa se za zmanjšanje primarnega -Si. Na velikost kristalnega zrna α-Al vpliva dodatek udrobnjevalca Al-Ti-B. Dodatek Mg (0,4 do 0,6 mas %) ter Cu (0,7 do 2,5 mas %) v zlitinah Al-Si omogočata izločevalno utrjevanje livarskih zlitin. Dodatek cinka pa omogoča visoko duktilnost ter dobre trdnostne lastnosti. Ta reagira z bakrom ali magnezijem, ter tvori zlitine z visoko solidus temperaturo. Namen diplomskega dela je bil analizirati vpliv dodatka molibdena in cirkonija na potek strjevanja, ter izoblikovanje ohlajevalne krivulje zlitine Silafont-36 (AlSi10MnMg). Uporabili smo zlitino Silafont-36, ter dve predzlitini AlMo5 in AlZr10. Izdelali smo šest eksperimentalnih vzorcev z različnimi dodatki in kombinacijami cirkonija ali/in molibdena. Po opravljeni kemični analizi, smo s programom ThermoCalc izračunali potek ravnotežnega strjevanja in izračunali ravnotežni fazni diagram. Nato smo določili karakteristične temperature strjevanja iz posnetih ohlajevalnih krivulj in s pomočjo njihovega odvoda v programu Origon 9.0 Na podlagi rezultatov diferenčne vrstične kalorimetrije (DSC) ter termodinamičnega ravnotežnega izračuna smo dobljene karakteristične temperature strjevanja eksperimentalnih zlitin okarakterizirali. Tako smo ugotovili vpliv Zr in/ali Mo na potek strjevanja zlitine Silafont-36.

Language:Slovenian
Keywords:zlitina Silafont-36, dodatek Zr in/ali Mo, enostavna termična analiza, diferenčna vrstična kalorimetrija, termodinamični izračun faznih ravnotežij
Work type:Bachelor thesis/paper (mb11)
Organization:NTF - Faculty of Natural Sciences and Engineering
Year:2017
Views:1226
Downloads:1307
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Secondary language

Language:English
Title:Thermodynamic characterization of Al-alloy Silafont-36
Abstract:
Among metals, aluminium is one of most common material used in various applications, almost always with certain alloying elements (Cu, Mg, Si, Mn, Zn, Fe, etc.) to get as close as possible to desired properties of material. Adding silicon for example, improves castability and increases resistance to wear. Manganese (up to 0.6 mass %) prevents formation of an undesirable β-Al5FeSi phase, which is needle-shaped that causes notch effect and poorer mechanical and corrosion properties. In order to reduce the eutectic β-Si, the Na or Sr modifiers are usually added. Phosphorus is added to reduce the size of primary β-Si. Size of crystal grain α-Al is influenced by the addition of the Al-Ti-B grain refiner. The addition of Mg (0.4 to 0.6 mass %) and Cu (0.7 to 2.5 mass %) in alloys of Al-Si allow the percipitation hardening. Zinc is added to get high ductility and good mechanical properties and it also reacts with copper and magnesium which then forms alloys with a high solidus temperature. The purpose of the diploma work was to analyse the effect of addition of molybdenum and zirconium on the process of solidification and the formation of the cooling curve of the alloy Silafont-36 (AlSi10MnMg). We used the Silafont-36 alloy and two master alloys AlMo5 and AlZr10. We made six experimental samples with various concentrations and combinations of zirconium and molybdenum. After a chemical analysis, we used ThermoCalc program to calculate the course of equilibrium solidification and equilibrium phase diagram. Next we recorded the cooling curve and by using the derivative of the cooling curve in the Origon 9.0 program we determined the transformation temperatures of phases during solidification. Based on the results of differential scanning calorimetry (DSC) and thermodynamic equilibrium calculation we characterized obtained temperatures of different solidification phases. In that way we were able to determine influence of Zr and Mo on the solidification of Silafont-36 alloy.

Keywords:Siladont-36 alloy, Zr and / or Mo, simple thermal analysis, differential scanning calorimetry, thermodynamic calculation of equilibrium phase

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