Self-repair by stress-induced diffusion of noble elements during oxidation of Zr48Cu36Al8Ag8 bulk metallic glass. (15th April 2019)

• Record Type: Journal Article
• Authors: Haratian, Saber; Grumsen, Flemming B.; Villa, Matteo; Christiansen, Thomas L.; Somers, Marcel A.J.
• Is Part Of: Scripta materialia. Number 164(2019)
• Page Start: 126
• Page End: 129
• Publication Date: 2019-04-15
• Subjects: Zr-Cu-Al-Ag BMG -- Long-term oxidation behavior -- In-situ X-ray diffraction -- Oxide zones characterization; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.01.045
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Long-term oxidation behavior of Zr48 Cu36 Al8 Ag8 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 CuOx, Ag, and ZrO2, and an inner oxide zone (IOZ) consisting of tetragonal ZrO2 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 ZrO2 formation. Segregation of noble elements towards these oxidation-generated free surfaces "repairs" the micro-cracks and can consistently explain the microstructural features. Graphical abstract: Unlabelled Image