Vpliv parametrov staranja zlitine EN AW 6101 na mehanske lastnosti in električno prevodnost

Bučar, Tomaž (avtor), Medved, Jožef (mentor), Cvahte, Peter (komentor)

Zlitina EN AW 6101 spada v skupino aluminijevih zlitin 6XXX, katerih glavna zlitinska elementa sta magnezij in silicij, ki skupaj tvorita fazo Mg2Si. Ta faza omogoča dobro kombinacijo mehanske trdnosti in električne prevodnosti, zlitine te skupine pa so primerne za iztiskavanje zaradi dobre oblikovalnosti, varivosti, obdelovalnosti in odpornosti proti koroziji. Zlitina EN AW 6101 se uporablja predvsem v elektroenergetskih aplikacijah, kot so električni vodniki, zbiralke in konstrukcijski elementi, kjer sta poleg mehanske trdnosti pomembni tudi električna in toplotna prevodnost. V diplomskem delu smo preučevali vpliv parametrov umetnega staranja na mehanske lastnosti in električno prevodnost zlitine EN AW 6101. Vzorci so bili kaljeni in starani pri temperaturah: 150, 160 in 170 °C v različnih časovnih razponih, pri čemer smo ugotavljali, kako temperatura in čas staranja vplivata na izločanje faze Mg2Si ter posledično na lastnosti materiala. Opazovali smo tudi, kako različni parametri staranja vplivajo na mikrostrukturo zlitine in opravili termodinamične izračune s pomočjo programa Thermo-Calc ter izrisali izopletni ravnotežni fazni diagram, diagram deleža faz in Scheilov diagram za preiskovano zlitino. Pri termodinamičnih izračunih smo ugotovili, da se pri strjevanju zlitine EN AW 6101 najprej strjujejo kristali primarnega αAl, nato različne železove faze, med katerimi je pomembnejša Al9Fe2Si2 in najpomembnejša utrjevalna faza Mg2Si. Mikrostrukture kažejo drobno in homogeno sestavo po celotnem preseku, brez opaznih razlik v velikosti in porazdelitvi faz po kaljenju ter po različnih časih staranja. Pri analizi mehanskih lastnosti in električne prevodnosti smo ugotovili, da nismo dosegli standardne vrednosti za preiskovano zlitino v kaljenem stanju, v umetno staranem stanju pa so bile dosežene pri vseh treh temperaturah staranja, z večjimi vrednostmi pri temperaturi staranja 170 °C.

• Jezik: Slovenski jezik
• Ključne besede: aluminijeva zlitina, EN AW 6101, termodinamični izračun, mikrostruktura, mehanske lastnosti, električna prevodnost
• Vrsta gradiva: Diplomsko delo/naloga
• Organizacija: NTF - Naravoslovnotehniška fakulteta
• Leto izida: 2026
• PID: 20.500.12556/RUL-187324
• Datum objave v RUL: 10.09.2026

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Influence of Ageing Parameters of EN AW 6101 Alloy on Mechanical Properties and Electrical Conductivity

Izvleček

Alloy EN AW 6101 belongs to the group of 6XXX aluminium alloys, whose main alloying elements are magnesium and silicon, which together form the Mg₂Si phase. This phase enables a good combination of mechanical strength and electrical conductivity, and alloys of this group are suitable for extrusion due to their good formability, weldability, machinability, and corrosion resistance. Alloy EN AW 6101 is used primarily in power engineering applications, such as electrical conductors, busbars, and structural components, where both electrical and thermal conductivity are important alongside mechanical strength. In the diploma thesis, we studied the influence of artificial ageing parameters on the mechanical properties and electrical conductivity of alloy EN AW 6101. Specimens were quenched and aged at temperatures of 150, 160, and 170 °C over various time intervals, during which we investigated how the ageing temperature and time affect the precipitation of the Mg₂Si phase and, consequently, the material properties. We also observed how different ageing parameters influence the microstructure of the alloy, and performed thermodynamic calculations using the Thermo-Calc software, plotting the isopleth equilibrium phase diagram, the phase fraction diagram, and the Scheil diagram for the investigated alloy. The thermodynamic calculations revealed that during solidification of alloy EN AW 6101, primary αAl crystals solidify first, followed by various iron-containing phases, among which Al₉Fe₂Si₂ is the more notable, and the most important strengthening phase Mg₂Si, which forms a eutectic with the αAl phase. The microstructures show a fine and homogeneous composition throughout the cross-section, with no observable differences in the size and distribution of phases between the quenched and the variously aged specimens. Analysis of the mechanical properties and electrical conductivity showed that the standard values for the investigated alloy in the quenched condition were not achieved; however, in the artificially aged condition they were met at all three ageing temperatures, with higher values obtained at an ageing temperature of 170 °C.

• Ključne besede: aluminium alloy, EN AW 6101, thermodynamic calculation, microstructure, mechanical properties, electrical conductivity