20.500.12556/RUL-135969 Homogenisation efficiency assessed with microstructure analysis and hardness measurements in the EN AW 2011 aluminium alloy When extruding the casted rods from EN AW 2011 aluminium alloys, not only their homogenized structure, but also their extrudable properties were significantly influenced by the hardness of the alloy. In this study, the object of investigations was the EN AW 2011 aluminium alloy, and the effect of homogenisation time on hardness was investigated. First, homogenisation was carried out at 520 °C for different times, imitating industrial conditions. After homogenisation, the samples were analysed by hardness measurements and further characterised by microscopy and image analysis to verify the influence of homogenisation on the resulting microstructural constituents. In addition, non-equilibrium solidification was simulated using the program Thermo-Calc and phase formation during solidification was investigated. The homogenisation process enabled more rounded shape of the Al$_2$Cu eutectic phase, equilibrium formation of the phases, and the precipitation in the matrix, leading to a significant increase in the hardness of the EN AW 2011 aluminium alloy. The experimental data revealed a suitable homogenisation time of 4–6 h at a temperature of 520 °C, enabling optimal extrusion properties. EN AW 2011 aluminium alloy thermodynamic equilibrium intermetallic phases eutectic homogenisation hardness true false true Angleški jezik Ni določen Članek v reviji 2022-04-05 10:00:58 2022-04-05 10:00:58 2022-09-15 04:13:00 0000-00-00 00:00:00 2021 0 0 11 str. iss. 8, art. 1211 Vol. 11 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 2075-4701 10.3390/met11081211 72040195 RAZ_Voncina_Maja_2021.pdf RAZ_Voncina_Maja_2021.pdf 1 A8E1EFAB9FA4959C0DB36EADA5CA11B4 db6f95f96595917a4d189df4af5abcce9ed5b909cbe88ef3d2a3e0ebb7b06820 bc747cbb-b4b6-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=155313 https://www.mdpi.com/2075-4701/11/8/1211 0 93d8e881-b4b6-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=155312 Naravoslovnotehniška fakulteta 0 0 0