Effects of Sn addition on the microstructure, mechanical properties and corrosion behavior of Ti-Nb-Sn alloys

Autor(es)

Moraes, Paulo E. L. ^[1] ; Contieri, Rodrigo J. ^[1] ; Lopes, Eder S. N. ^[1] ; Robin, Alain ^[2] ; Caram, Rubens ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Mech Engn, BR-13083860 Campinas, SP - Brazil

^[2] Univ Sao Paulo, Sch Engn Lorena, BR-1260000 Lorena, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS CHARACTERIZATION; v. 96, p. 273-281, OCT 2014.
• Citações Web of Science: 33

Resumo

Ti and Ti alloys are widely used in restorative surgery because of their good biocompatibility, enhanced mechanical behavior and high corrosion resistance in physiological media. The corrosion resistance of Ti-based materials is due to the spontaneous formation of the TiO2 oxide film on their surface, which exhibits elevated stability in biological fluids. Ti-Nb alloys, depending on the composition and the processing routes to which the alloys are subjected, have high mechanical strength combined with low elastic modulus. The addition of Sn to Ti-Nb alloys allows the phase transformations to be controlled, particularly the precipitation of omega phase. The aim of this study is to discuss the microstructure, mechanical properties and corrosion behavior of cast Ti-Nb alloys to which Sn has been added. Samples were centrifugally cast in a copper mold, and the microstructure was characterized using optical microscopy, scanning electron microscopy and X-ray diffractometry. Mechanical behavior evaluation was performed using Berkovich nanoindentation, Vickers hardness and compression tests. The corrosion behavior was evaluated in Ringer's solution at room temperature using electrochemical techniques. The results obtained suggested that the physical, mechanical and chemical behaviors of the Ti-Nb-Sn alloys are directly dependent on the Sn content. (C) 2014 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 11/23942-6 - Fenômenos de precipitação de fases alfa e ômega e recristalização em ligas Ti-Nb-Sn deformadas plasticamente a frio
• Beneficiário: Rubens Caram Junior
• Modalidade de apoio: Auxílio à Pesquisa - Regular