Long-term oxidation behavior of Zr 48 Cu 36 Al 8 Ag 8 BMG under atmospheric conditions at 600 K was investigated using in-situ X-ray diffraction analysis. Two oxide zones develop: an outer oxide zone (OOZ), consisting of a stratified distribution of CuO x , Ag, and ZrO 2 , and an inner oxide zone (IOZ) consisting of tetragonal ZrO 2 showing Cu-enriched lines inclined to the surface. The stratified microstructure in the OOZ and the Cu enrichments in the IOZ are ascribed to micro-cracks resulting from the compressive stresses induced by ZrO 2 formation. Segregation of noble elements towards these oxidation-generated free surfaces “repairs” the micro-cracks and can consistently explain the microstructural features.
Self-repair by stress-induced diffusion of noble elements during oxidation of Zr 48 Cu 36 Al 8 Ag 8 bulk metallic glass / Haratian, S.; Grumsen, F. B.; Villa, M.; Christiansen, T. L.; Somers, M. A. J.. - In: SCRIPTA MATERIALIA. - ISSN 1359-6462. - 164:(2019), pp. 126-129. [10.1016/j.scriptamat.2019.01.045]
Self-repair by stress-induced diffusion of noble elements during oxidation of Zr 48 Cu 36 Al 8 Ag 8 bulk metallic glass
Villa M.;
2019-01-01
Abstract
Long-term oxidation behavior of Zr 48 Cu 36 Al 8 Ag 8 BMG under atmospheric conditions at 600 K was investigated using in-situ X-ray diffraction analysis. Two oxide zones develop: an outer oxide zone (OOZ), consisting of a stratified distribution of CuO x , Ag, and ZrO 2 , and an inner oxide zone (IOZ) consisting of tetragonal ZrO 2 showing Cu-enriched lines inclined to the surface. The stratified microstructure in the OOZ and the Cu enrichments in the IOZ are ascribed to micro-cracks resulting from the compressive stresses induced by ZrO 2 formation. Segregation of noble elements towards these oxidation-generated free surfaces “repairs” the micro-cracks and can consistently explain the microstructural features.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
