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

Autor(es)

Goncalves, Vinicius Richieri Manso ; Caha, Ihsan ; Alves, Alexandra Cruz ; Toptan, Fatih ; Rocha, Luis Augusto

• Tipo de documento: Artigo Científico
• Fonte: METALS; v. 12, n. 6, p. 17-pg., 2022-06-01.

Resumo

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 beta-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 alpha-Ti and beta-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 beta 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. (AU)

• Processo FAPESP: 19/07953-0 - Síntese in-situ de compósitos de matriz à base de Ti com gradiente funcional produzidos por rota metalúrgica líquida de baixo custo
• Beneficiário: Vinícius Richieri Manso Gonçalves
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 17/24300-4 - Um novo conceito para produzir materiais bio-funcionalizados com gradiente de propriedades para implantes ortopédicos
• Beneficiário: Luís Augusto Sousa Marques da Rocha
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/00746-6 - Desenvolvimento e caracterização de compósitos in-situ de matriz de Ti-Nb para aplicação biomédica
• Beneficiário: Vinícius Richieri Manso Gonçalves
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto