20.500.12556/RUL-131557 Microstructural anisotropy of magnetocaloric gadolinium cylinders effect on the mechanical properties of the material The development of advanced materials and technologies based on magnetocaloric Gd and its compounds requires an understanding of the dependency of mechanical properties on their underlying microstructure. Therefore, the aim of the study was to characterize microstructural inhomogeneities in the gadolinium that can be used in magnetocaloric refrigeration systems. Microstructures of magnetocaloric gadolinium cylinders were investigated by light microscopy and FE-SEM (Field Emission Scanning Electron Microscopy), EDS (Energy-dispersive X-ray Spectroscopy), and BSE (Back-scattered Electrons) in both the extrusion and the extrusion-transversal directions. XRD (X-ray Diffraction) analyses were performed to reveal the presence of calcium- and fluorine-based compounds. Metallographic characterization showed an oxidized and inhomogeneous microstructure of the cross-sections. The edges and the outer parts of the cylinders were oxidized more intensively on the surfaces directly exposed to the processing tools. Moreover, a significant morphological anisotropy of the non-metallic inclusions was observed. CaF inclusions act as active nucleation sites for internal oxidation. The non-metallic, Ca- and F-containing inclusions can be classified as complex calciumoxyfluorides. The solubility of Er and Yb in the CaF was negligible compared to the Gd matrix and/or the oxide phase. Lower mechanical properties of the material are a consequence of the lower structural integrity due to selective oxidation of surfaces and interfaces. Gadolinium magnetocaloric inclusions selective oxidation mechanical properties magnetokaloričnost gadolinij vključki selektivna oksidacija mehanske lastnosti true false true Angleški jezik Slovenski jezik Članek v reviji 2021-09-29 10:44:31 2021-09-29 10:44:33 2022-09-10 04:12:26 0000-00-00 00:00:00 2016 0 0 14 str. iss. 5, art. 382 Vol. 9 2016 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.1:67.017(045) 1996-1944 10.3390/ma9050382 1206698 RAZ_Steiner_Petrovic_Darja_2016.pdf RAZ_Steiner_Petrovic_Darja_2016.pdf 1 B7CCE1E610D2854F611061EB86DBC437 730c8449f3848458be9b0f92166734d6ddc0318cffa717fbaad460252c042e3d 203f9346-2102-11ec-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=148924 http://www.mdpi.com/1996-1944/9/5/382 1 300a95b8-2101-11ec-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=148922 Fakulteta za strojništvo Naravoslovnotehniška fakulteta 0 0 0