Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/24040
Title: Nature of oxide layer formed on NiTi by anodic oxidation in methanol
Authors: Cheng, FT
Shi, P
Man, HC 
Keywords: Indentation
NiTi
Oxidation
Shape memory alloy
Thick coating
TiO2
Issue Date: 2005
Publisher: North-Holland
Source: Materials letters, 2005, v. 59, no. 12, p. 1516-1520 How to cite?
Journal: Materials letters 
Abstract: NiTi was galvanostatically anodized in a methanolic electrolyte to form a thick (more than 10 μm) and uniform oxide layer. The oxide layer was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDS), thin-film X-ray diffractometry (TF-XRD), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The layer was composed of a mixture of TiO2 and metallic Ni while the surface of the layer contained non-stoichiometric nickel titanate (NiTiO3-x). The as-prepared coating was free of cracks and composed of very fine crystallites. Vickers indentation showed that the as-prepared layer was ductile, with a low Vickers hardness of about 1.50 GPa. The high room-temperature ductility of the oxide coating was attributable to the nanosized crystallites in the coating.
URI: http://hdl.handle.net/10397/24040
ISSN: 0167-577X
EISSN: 1873-4979
DOI: 10.1016/j.matlet.2005.01.013
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