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Oxidation behaviour of Ni60Nb30Ta10 metallic glass below its glass transition temperature
2017 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 728, p. 1146-1152Article in journal (Refereed) Published
Abstract [en]

The oxidation behaviour of Ni60Nb30Ta10 metallic glass in air was investigated below its glass transition temperature (665 °C). The oxidation kinetics followed two-stage parabolic rate law at 450 and 550 °C. The parabolic rate constant increased with increase in the oxidation temperature. At 450 °C, a thin amorphous oxide film consisting predominantly Nb2O5 and Ta2O5, with traces of NiO and Ni2O3 was observed on the surface. At 550 °C, oxidation induced outward diffusion of Ni2+ and Ni3+ ions resulted in a thick oxide layer, containing extensive cubic NiO and monoclinic Ni2O3 with traces of metallic Ni on the surface. Interestingly, at 550 °C the Nb2O5 and Ta2O5 oxides were completely absent on the surface of the oxidised layer.

Place, publisher, year, edition, pages
2017. Vol. 728, p. 1146-1152
Keywords [en]
Metallic glass, Oxidation, Oxide layer, Kinetics, Diffusion, X-ray photoelectron spectroscopy
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:du-31402DOI: 10.1016/j.jallcom.2017.09.040OAI: oai:DiVA.org:du-31402DiVA, id: diva2:1381208
Available from: 2019-12-20 Created: 2019-12-20 Last updated: 2019-12-20Bibliographically approved

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S0925838817330694

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Jayamani, Jayaraj

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