Tribological Performance and Electrochemical Behavior of Ti‐29Nb‐14Ta‐4.5Zr Alloy in Simulated Physiological Solution. Issue 2 (14th October 2019)

• Record Type: Journal Article
• Authors: Haftlang, Farahnaz; Zarei-Hanzaki, Abbas; Abedi, Hamid Reza; Kalaei, Mohammad Amin
• Is Part Of: Advanced engineering materials. Volume 22:Issue 2(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-10-14
• Subjects: dry sliding wear -- electrochemical behavior -- simulated body fluid -- titanium alloy -- tribological performance; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201900758
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : 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. Abstract : Formation of the nano‐ω/α/α″ phase in the β‐matrix is successfully done during different heat treatments. Considerable improvement in wear behavior of β Ti‐29Nb‐13Ta‐4.6Zr (TNTZ) is observed after precipitation of the ω/α phase. The wear mechanism consists of oxidation/adhesion wear. TNTZ alloy has satisfactory corrosion resistance in simulated body fluid. Pitting corrosion and adhesion wear retard effectively in β + ω/α specimens.