Tribocorrosion Study of Ordinary and Laser-Melted Ti6Al4V Alloy

Titanium alloys are used in biomedical implants, as well as in other applications, due to the excellent combination of corrosion resistance and mechanical properties. However, the tribocorrosion resistance of titanium alloy is normally not satisfactory. Therefore, surface modification is a way to im...

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Bibliographic Details
Published in:Metals (Basel ) 2016-10, Vol.6 (10), p.253-253
Main Authors: Silva, Danillo, Churiaque, Cristina, Bastos, Ivan, Sánchez-Amaya, José
Format: Article
Language:English
Subjects:
Biocompatibility
Computer simulation
Corrosion
Corrosion resistance
Corrosion resistant alloys
Corrosion tests
Corrosive wear
Exposure
Finite element method
laser-treated titanium alloy
Lasers
Martensite
Mechanical properties
Melting
Metals
Prostheses
Rubbing
Stress concentration
Surgical implants
Ti6Al4V
Titanium alloys
Titanium base alloys
Transplants & implants
tribocorrosion
Wear
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Summary:Titanium alloys are used in biomedical implants, as well as in other applications, due to the excellent combination of corrosion resistance and mechanical properties. However, the tribocorrosion resistance of titanium alloy is normally not satisfactory. Therefore, surface modification is a way to improve this specific performance. In the present paper, laser surface-modified samples were tested in corrosion and pin-on-disk tribocorrosion testing in 0.90% NaCl under an average Hertzian pressure of 410 MPa against an alumina sphere. Laser-modified samples of Ti6Al4V were compared with ordinary Ti6Al4V alloy. Electrochemical impedance showed higher modulus for laser-treated samples than for ordinary Ti6Al4V ones. Moreover, atomic force microscopy revealed that laser-treated surfaces presented less wear than ordinary alloy for the initial exposure. For a further exposure to wear, i.e., when the wear depth is beyond the initial laser-affected layer, both materials showed similar corrosion behavior. Microstructure analysis and finite element method simulations revealed that the different behavior between the initial and the extensive rubbing was related to a fine martensite-rich external layer developed on the irradiated surface of the fusion zone.
ISSN:2075-4701
2075-4701
DOI:10.3390/met6100253