Abstract
A nanograined (NG) layer with an average grain size of less than 100 nm has been successfully prepared on a Ti–6Al–4V sheet surface by sliding friction treatment (SFT). The electrochemical corrosion/passive behavior and mechanical properties of an NG Ti–6Al–4V sheet were examined in this study. A bi-layer passive film that consisted of an outer TiO2-rich layer and an inner Al2O3-rich layer was formed on either an NG or coarse-grained (CG) surface. The improved corrosion was mainly caused by the enhanced stability and thickness of the passive layer. Tensile experiments were carried out to evaluate the mechanical properties at ambient temperature. The NG Ti–6Al–4V sample exhibited the high yield strength (956 MPa) with a moderate elongation of 8%. These superior comprehensive properties demonstrated its potential as a biomedical material.
Highlights
Ti–6Al–4V alloy was originally developed for aerospace application, and was the first titanium alloy used as a biomaterial for orthopedic and dental bioimplants, owing to its well-known combination properties, including high specific strength, excellent workability, and biocompatibility [1,2]
It is found that the Bragg peak of the NG sample was broadened significantly compared to its CG form, which is mainly attributed to the formation of a nanocrystalline structure and lattice distortion induced by sliding friction treatment (SFT)
The electrochemical impedance spectroscopy (EIS), potentiostatic polarization (PP), and MS curves reveal that the passive layers on the NG and CG surfaces present a
Summary
Ti–6Al–4V alloy was originally developed for aerospace application, and was the first titanium alloy used as a biomaterial for orthopedic and dental bioimplants, owing to its well-known combination properties, including high specific strength, excellent workability, and biocompatibility [1,2]. Ti–6Al–4V alloy exhibits an excellent corrosion resistance that benefited from the formation of the compact rutile TiO2 layer [3,4] It has gradually lost its dominance as the most viable orthopedic alloy, because the metal ions (such as V3+, V5+, and Al3+) resulted from passive layer dissolution and wearing have a great toxic effect during long-term performance [5,6]. A new surface modification technique, sliding friction treatment (SFT), was developed with potential industrial application By means of this technology, a clean and thick nanocrystalline surface layer on a large dimensional bulk metal sheet can be achieved with a good surface quality [14]. The CG Ti–6Al–4V alloy is examined as control
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