Structure and nano-mechanical characteristics of surface oxide layers on a metallic glass

Caron, Arnaud, Qin, C. L., Gu, L., Gonzalez Sanchez, Sergio, Shluger, A., Fecht, H.-J., Louzguine-Luzgin, Dimitri and Inoue, Akihisa (2011) Structure and nano-mechanical characteristics of surface oxide layers on a metallic glass. Nanotechnology, 22 (9). 095704. ISSN 0957-4484

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Abstract

Owing to their low elastic moduli, high specific strength and excellent processing characteristics in the undercooled liquid state, metallic glasses are promising materials for applications in micromechanical systems. With miniaturization of metallic mechanical components down to the micrometer scale, the importance of a native oxide layer on a glass surface is increasing. In this work we use TEM and XPS to characterize the structure and properties of the native oxide layer grown on Ni62Nb38 metallic glass and their evolution after annealing in air. The thickness of the oxide layer almost doubled after annealing. In both cases the oxide layer is amorphous and consists predominantly of Nb oxide. We investigate the friction behavior at low loads and in ambient conditions (i.e. at T = 295 K and 60% air humidity) of both as-cast and annealed samples by friction force microscopy. After annealing the friction coefficient is found to have significantly increased. We attribute this effect to the increase of the mechanical stability of the oxide layer upon annealing.

Item Type:	Article
Subjects:	F200 Materials Science
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Becky Skoyles
Date Deposited:	09 Nov 2015 15:08
Last Modified:	12 Oct 2019 22:54
URI:	http://nrl.northumbria.ac.uk/id/eprint/24370

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