期刊
ACTA MATERIALIA
卷 97, 期 -, 页码 282-290出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.06.039
关键词
Bulk metallic glass; Native oxidation process; Electrical conductivity; Structure of the native surface oxide; Transmission electron microscopy; Conductive atomic force microscopy
资金
- World Premier International Research Center Initiative (WPI), MEXT, Japan
- Ministry of Education and Science of the Russian Federation [K2-2014-013, 14.613.21.0022]
Formation of a native oxide layer on the surface of bulk metallic glasses (BMGs) influences significantly the nanoscale tribological properties and mechanical behavior of the BMGs used in nanodevices. However, our knowledge of the native oxidation process on the BMG surface and structure of the corresponding oxides remains limited because the oxide layer is very thin. Here we conducted a combined state-of-the-art experimental technique study of the atomic structure, oxidations states and electrical conductivity of the native surface oxides on a Cu-Zr-Al BMG formed at ambient conditions by aberration-corrected scanning transmission electron microscopy (STEM), X-ray photoelectron spectroscopy (XPS) and conductive atomic force microscopy (AFM). This allowed shedding light on the atomic structure, metal oxidation state, growth behavior and nanoscale electrical properties of the surface oxide. The conductive AFM measurements reveal that the electrical conductivity of the native oxide layer transits from the initially metallic to a nonlinear one after some air exposure, and finally changes to insulative state. These findings represent a significant step forward in the knowledge of surface oxides and open up the possibility of fabricating nanoscale electrical devices based on BMGs with controllable conductivity. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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