Solute lean Ti-Nb-Fe alloys: An exploratory study

Autor(es)

Salvador, Camilo A. F. ; Dal Bo, Mariana R. ; Costa, Fernando H. ; Taipina, Marcia O. ; Lopes, Eder S. N. ; Caram, Rubens

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 65, p. 761-769, JAN 2017.
• Citações Web of Science: 5

Resumo

In this study, we explored the Ti-Nb-Fe system to find an optimal cost-effective composition with the lowest elastic modulus and the lowest added Nb content. Six Ti-(31-4x)Nb-(1+0.5x)Fe ingots were prepared and Nb was substituted with Fe, starting at Ti-31Nb-1.0Fe and going up to Ti-11Nb-3.5Fe (wt%). The ingots were subjected to cold rolling, recrystallization and solution treatment, followed by water-quenching (WQ), furnace cooling (FC) or step-quenching to 350 degrees C, which caused massive formation of isothermal omega phase. All the water quenched alloys displayed athermal omega phase, which is apparently the result of fully collapsed beta phase. The Fe content improved the compressive strength of the alloys. In the FC alloys, substitution with Fe favored the formation of a phase instead of omega phase, giving rise to a solute-rich beta phase with a lattice parameter of 0.3249 nm. Among the FC alloys, the lowest modulus of 83 +/- 4 GPa was obtained in the Ti-19Nb-2.5Fe alloy, which exhibited fine and well dispersed a precipitation and absence of omega phase. DSC experiments indicated that the experimental alloys showed varying phase stability during heating. (AU)

• Processo FAPESP: 14/24449-0 - Transformações de fase, microestrutura e propriedades mecânicas de novas ligas de titânio beta metaestáveis do sistema Ti-Nb-Zr-Fe (TNZF) para aplicação biomédica
• Beneficiário: Camilo Augusto Fernandes Salvador
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/06099-1 - Nucleação da fase alfa em ligas de titânio tipo beta mestaestável no sistema Ti-Nb-Fe
• Beneficiário: Rubens Caram Junior
• Modalidade de apoio: Auxílio à Pesquisa - Regular