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Tribological Performance and Electrochemical Behavior of Ti‐29Nb‐14Ta‐4.5Zr Alloy in Simulated Physiological Solution
Author(s) -
Haftlang Farahnaz,
Zarei-Hanzaki Abbas,
Abedi Hamid Reza,
Kalaei Mohammad Amin
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201900758
Subject(s) - materials science , microstructure , tribology , alloy , dielectric spectroscopy , martensite , metallurgy , corrosion , oxide , composite material , electrochemistry , chemistry , electrode
Herein, the tribological performance and in vitro electrochemical behavior of Ti‐29Nb‐13Ta‐4.6Zr (TNTZ) reinforced by various nanosized phases are investigated. The various microstructures—1) single β‐phase, 2) β + α″ martensite, 3) β + ω, and 4) β + α—are prepared through purposeful heat treatment and subsequent aging. Sliding wear tests are performed under the applied load of 5 N and sliding speed of 0.3 mm s −1 against Ti‐6Al‐4V extra‐low interstitial alloy. Wear performance of the heat‐treated alloys significantly improves compared with the solution‐treated state, where the β + ω microstructure possesses the lowest weight losses. In fact, the precipitation of the nonsharable hard nanophase improves plastic shear resistance of the subsurface and in turn prohibits premature crack initiation. Such a supporting effect of the subsurface layer also increases the stability of the superficial oxide layer and decreases the amount of metallic/oxide debris. The electrochemical performances of the elaborated microstructures are assessed through potentiodynamic polarization and electrochemical impedance spectroscopy in the simulated body fluid. Interestingly, the β + ω alloy exhibits the extraordinary corrosion resistance compared to other structures. This is attributed to the uniform distribution, spherical morphology, and coherent interface of the ω‐nanoprecipitates.