Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Tribology: Surfaces and Nanostructures
O 20.2: Poster
Montag, 7. März 2016, 17:00–19:30, Poster A
Surface oxidation of metallic glass surfaces and its effect on nanotribology — •Kai Rittgen1,2, Arnaud Caron3, and Roland Bennewitz1,2 — 1INM Leibniz-Institute for New Materials, Campus D2.2, 66123 Saarbrücken, Germany — 2Department of Experimental Physics, University of Saarbrücken, 66123 Saarbrücken, Germany — 3Korea University of Technology and Education, Department of Energy, Materials and Chemical Engineering, Chungcheongnam-do, 31253 Republic of Korea
Owing to their high strength and hardness metallic glasses have been recognized as potential materials with enhanced wear resistance for tribological applications. While metallic glasses are prone to oxidation, the formation of surface oxide and its impact on tribological properties has been scarcely investigated. In this work we use a correlative approach to determine the influence of surface structure and chemistry on the friction and wear of metallic glass surfaces. Surface structural properties of several different metallic glasses are investigated by AFM in ultra high vacuum after Ar-sputtering and controlled oxidation treatments. Surface oxides are further characterized by SEM, TEM, and XPS. The tribological response of metallic glass surfaces with and without oxide layer is determined by AFM- and nano-scratching in air and in ultra high vacuum. Sputtered and oxidized surfaces of metallic glasses and their crystalline counterparts were compared to determine the relevant physical processes in wear mechanisms.