Improved tribocorrosion behavior on bio-functionalized β-type titanium alloy by the pillar effect given by TiN reinforcements

Çaha, Ihsan; Alves, Alexandra Manuela Vieira Cruz Pinto; Chirico, Caterina; Pinto, A. M. P.; Tsipas, S.A.; Gordo, E.; Toptan, Fatih

doi:10.1016/j.surfcoat.2021.127122

Cited by 13 publications

(1 citation statement)

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“…However, their inherent low fracture toughness and their limited adhesion to the substrate may result, under sliding conditions, in the formation of third-body particles, which act as extra abrasives [15]. Hence, Ti matrix composites (TMCs) emerge as an attractive option for wear-resistant biomedical applications since the well-integrated reinforcing phase can shield the matrix from the load-carrying effect [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Improved Tribocorrosion Behavior Obtained by In-Situ Precipitation of Ti2C in Ti-Nb Alloy

Gonçalves

Çaha

Alves

et al. 2022

Metals

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Novel in-situ Ti-based matrix composites (TMCs) were developed through the reactive hot pressing of Ti + NbC powder blends. Due to the chemical reaction that occurred in the solid-state during processing, the produced samples were composed of an Nb-rich β-Ti phase that formed a metallic matrix along with Ti2C as a reinforcing phase. By employing different proportions of Ti:NbC, the phase composition of the alloys was designed to contain different ratios of α-Ti and β-Ti. The present work investigated the corrosion and tribocorrosion behavior of the composites, compared to unreinforced Ti, in a phosphate-buffered solution (PBS) at body temperature. Corrosion tests included potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Tribocorrosion tests were carried out using a ball-on-plate tribometer with sliding performed at open circuit potential (OCP) and under anodic potentiostatic conditions. Results showed that the stabilization of the β phase in the matrix led to a decrease in the hardness. However, the formation of the in-situ reinforcing phase significantly improved the tribocorrosion behavior of the composites due to a load-carrying effect, lowering the corrosion tendency and kinetics under sliding. Furthermore, localized corrosion was not observed at the interface between the reinforcing phase and the matrix.

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