Tribocorrosion behavior of Ti64-xTa alloys fabricated through powder metallurgy

•Ti64-Ta alloys were successfully fabricated through solid-state sintering.•Corrosion performance was enhanced by Ta addition.•Higher corrosion potential drops were observed for Ti64-Ta alloys as compared to Ti64.•Low Ta additions decreased the wear rates of alloys during tribocorrosion.•Ti64-Ta all...

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Bibliographic Details
Published in:Materials letters 2020-12, Vol.280, p.128590, Article 128590
Main Authors: Chávez, J., Jimenez, O., Olmos, L., Farias, I., Flores-Jimenez, M., Suárez-Martínez, R., Cabezas-Villa, J.L., Lemus-Ruiz, J.
Format: Article
Language:English
Subjects:
Alloy powders
Body fluids
Corrosion
Corrosion effects
Corrosion potential
Corrosion rate
Corrosion resistance
Materials science
Mechanical properties
Metallurgical analysis
Powder metallurgy
Powder technology
Sintering
Titanium alloys
Titanium base alloys
Tribocorrosion
Wear
Wear rate
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Summary:•Ti64-Ta alloys were successfully fabricated through solid-state sintering.•Corrosion performance was enhanced by Ta addition.•Higher corrosion potential drops were observed for Ti64-Ta alloys as compared to Ti64.•Low Ta additions decreased the wear rates of alloys during tribocorrosion.•Ti64-Ta alloys with low Ta additions are suggested for implant fabrication. The tribocorrosion behavior in simulated-body fluid of Ti64-xTa (x = 5, 15 and 30 vol%) alloys fabricated by means of powder metallurgy was evaluated. Ti64-xTa alloys demonstrated a better passivation behavior in comparison to Ti64, forming a more stable passive film. In addition, an important increment in the polarization resistance, and a decrement in the corrosion rate were observed as an effect of Ta addition. Larger corrosion potential drops during tribocorrosion tests indicated that the passive films formed on Ti64-xTa alloys surface were easily removed as the Ta amount increased. Moreover, despite the detrimental in the mechanical properties caused by the addition of Ta, alloys containing 5 and 15 vol% of Ta improved the wear rate of Ti64. The results demonstrated that Ti64 alloys with low Ta amounts fabricated through powder metallurgy are potentially suitable for short-term implant applications.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.128590