Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/12392
Title: Improved tribocorrosion behavior obtained by in-situ precipitation of Ti2C in Ti-Nb alloy
Authors: Gonçalves, Vinícius Richieri Manso
Çaha, İhsan
Alves, Alexandra Cruz
Toptan, Fatih
Rocha, L. A.
São Paulo State University
Universidade do Minho
Universidade do Minho
01. Izmir Institute of Technology
Universidade do Minho
Keywords: Niobium carbide
Powder metallurgy
Tribocorrosion
Ti-based composites
Issue Date: Jun-2022
Publisher: MDPI
Abstract: 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.
URI: https://doi.org/10.3390/met12060908
https://hdl.handle.net/11147/12392
Appears in Collections:Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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