20.500.12556/RUL-135201 Determination of Al-2.18Mg-1.92Li alloy's microstructure degradation in corrosive environment The utilization of aluminum-lithium-magnesium (Al-Li-Mg) alloys in the transportation industry is enabled by excellent engineering properties. The mechanical properties and corrosion resistance are influenced by the microstructure development comprehending the solidification of coherent strengthening precipitates, precipitation of course and angular equilibrium phases as well as the formation and widening of the Precipitate-free zone. The research was performed to determine the microstructure degradation of Al-2.18Mg-1.92Li alloy in a corrosive environment using electrochemical measurements. The solidification sequence of the Al-2.18Mg-1.92Li alloy, obtained using Thermo–Calc software support, indicated the transformation of the α$_{Al}$ dendritic network and precipitation of AlLi (δ), Al$_2$LiMg (T), and Al$_8$Mg$_5$ (β) phase. All of the phases are anodic with respect to the α$_{Al}$ enabling microstructure degradation. To achieve higher microstructure stability, the sample was solution hardened at 520 °C. However, the sample in as-cast condition showed a lower corrosion potential (−749.84 mV) and corrosion rate (17.01 mm/year) with respect to the solution-hardened sample (−752.52 mV, 51.24 mm/year). Higher microstructure degradation of the solution-hardened sample is a consequence of δ phase precipitation at the grain boundaries and inside the grain of α$_{Al}$, leading to intergranular corrosion and cavity formation. The δ phase precipitates from the Li and Mg enriched the α$_{Al}$ solid solution at the solution-hardening temperature. Al-Mg-Li alloy solidification sequence as-cast solution hardening microstructure degradation true false true Angleški jezik Ni določen Članek v reviji 2022-02-28 14:44:01 2022-02-28 14:44:03 2022-09-14 04:12:08 0000-00-00 00:00:00 2021 0 0 13 str. iss. 4, art. 338 Vol. 11 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 2073-4352 10.3390/cryst11040338 80274947 RAZ_Kozina_Franjo_2021.pdf RAZ_Kozina_Franjo_2021.pdf 1 CCDD08C9B2F0632869FDA4A54A20E937 1fc74cf3ceb364bc3a13e84ea7e1c49d2b05fdd642e4858a675bf344574c34c3 900c54b0-989c-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=154111 https://www.mdpi.com/2073-4352/11/4/338 0 5abd7a88-989c-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=154110 Naravoslovnotehniška fakulteta 0 0 0