20.500.12556/RUL-138217 Solidification behaviour and microstructure of AlSi7Mg cast alloy with addition of Li The constant need for the development of new alloys with an improved ratio between weight and strength is the driving force for the progress of the present work, which deals with the production of a new Al-cast alloy with the addition of lithium (Li). 0.8 wt% Li was added to the AlSi7Mg alloy. The solidification behaviour of such a new alloy was the focus of the work. The melt was produced in an inert gas atmosphere in an induction furnace. The solidification behaviour was described by CALPHAD simulations, optical microscopy, scanning electron microscopy (SEM) and simple thermal analysis. In addition, the Vickers hardness (HV) was measured 29 days after casting and compared with the results of the AlSi7Mg base alloy. Solidification proceeds somewhat differently from the base alloy, where the liquidus temperature is raised to 637 °C, where the primary AlLiSi phase forms, followed by α$_{Al}$ dendrites, eutectic β$_{Si}$ and other phases in the form of eutectics, which are known to occur during solidification of the AlSi7Mg alloy. The hardness of the new alloy is increased compared to the base alloy, especially at higher cooling rates, where the hardness gain is up to 36%. lithium addition Al-cast alloy solidification thermal analysis hardness true false true Angleški jezik Ni določen Članek v reviji 2022-07-13 03:47:18 2022-07-13 12:18:54 2022-09-15 04:16:25 0000-00-00 00:00:00 2022 0 0 Str. 2084-2092 Vol. 19 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 2238-7854 10.1016/j.jmrt.2022.05.171 110928131 1-s2.0-S2238785422008328-main.pdf 1-s2.0-S2238785422008328-main.pdf 1 CCB5C5547ACEF4AC8534A35A6C94986A e2827c8fc4102c697538ffe9f8c27115dbcc27ca41bf23db82f2c552a3581b2e d3d9b7cb-2eae-11ed-92af-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=160457 https://www.sciencedirect.com/science/article/pii/S2238785422008328 0 9cbbc27e-2eae-11ed-92af-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=160456 Naravoslovnotehniška fakulteta 0 0 0