Vpliv stopnje deformacije na potek DSC krivulj aluminijevih zlitin

Trdina, Jakob (avtor), Medved, Jože (mentor)

Aluminij in njegove zlitine se uporablja na veliko področjih zaradi dobre preoblikovalnosti in mehanskih lastnosti. Pomemben je predvsem zaradi svoje majhne gostote, dobre žilavosti in korozijske obstojnosti ter dobre električne in toplotne prevodnosti. Aluminijeva zlitina 8079 vsebuje 1 mas. % Fe in 0,24 mas. % Si. Zlitina ima visoko trdnost in dobro razteznost. Uporablja se za izdelavo pločevine in folije, ki je odporna na vlago, je zračno tesna, odporna proti obrabi, ohranja originalnost pakiranega izdelka. Folija je primerna za fleksibilna pakiranja, kot so pakiranja farmacevtskih izdelkov, cigaret, ter za izdelavo kondenzatorjev in izolacijskih materialov itd. Pri praktičnem delu diplomskega dela smo pripravili vzorce Al 99,7 in aluminijeve zlitine 8079. Iz vsake zlitine smo izdelali po osem vzorcev cilindrične oblike s premerom 5 mm in višino 2 mm oziroma 8 mm, da bodo tako optimalne velikosti za nadaljnjo diferenčno vrstično kalorimetrijo (DSC). Šest vzorcev vsake zlitine smo predhodno stisnili oziroma deformirali iz prvotne višine 8 mm na 6 mm, 4 mm in 2 mm ter jih nato pripravili za DSC- analizo velikosti 5 mm premera in 2 mm višine. Namen diplomskega dela je ugotoviti vpliv stopnje deformacije aluminijevih zlitin na potek DSC krivulje. S primerjavo DSC krivulj nedeformiranih in deformiranih vzorcev smo analizirali vpliv stopnje deformacije na karakteristične temperature pri ogrevanju in ohlajanju, na porabljene in izločene entalpije faznih transformacij ter na obliko krivulj.

• Jezik: Slovenski jezik
• Ključne besede: aluminij, zlitina 8079, deformacija, DSC
• Vrsta gradiva: Diplomsko delo/naloga
• Organizacija: NTF - Naravoslovnotehniška fakulteta
• Leto izida: 2019
• PID: 20.500.12556/RUL-110370
• COBISS.SI-ID: 1835103
• Datum objave v RUL: 14.09.2019

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Impact of deformation on the course of DSC curves of aluminium alloys

Izvleček

Aluminum with its alloys is used on many areas due to its good transformability and good mechanical properties. It is important especially because of its low density, good thoughness and corrosion resistance, good electrical and thermal conductivity. The 8079 aluminum alloy contains 1 wt % Fe in 0.24 wt % Si. The alloy has high strength and good elongation. It is used to produce sheets and foils that are moisture resistant, air tight, wear resistant, keeping originality of packaged product. The foil is suitable for flexible packaging, such as packaging of pharmaceuticals, cigarettes and manufacturing of capacitors and insulating materials, etc. At practical work of diploma work we prepared samples od Al99,7 alloy and aluminuim alloy 8079. Out of each alloy we made eight samples of cylindrical shape with a diameter of 5 mm and height 2 and 8 mm respectively, so they were optimally sized for further differential scanning calorimetry (DSC). Six samples of each alloy we beforehand compressed or deform from its original height of 8 mm to 6, 4 and 2 mm and were after mechanically processed to suit DSC sample dimensions of diameter of 5 mm and height of 2 mm. The purpose of diploma work is to find out the effect of deformation level of aluminium alloys to course of DSC curves. By comparing the DSC curves of undeformed and deformed samples we analized effect of deformation level to characteristic temperatures at heating and cooling, to consumed and released enthalpies of phase transtormations and to the shape of the curves.

• Ključne besede: aluminium, alloy 8079, deformation, DSC