Formation of alpha phase via pseudospinodal decomposition in Ti-Nb-Fe based alloys

Autor(es)

Salvador, Camilo A. F. ; Lopes, Eder S. N. ; Bettini, Jefferson ; Caram, Rubens

• Tipo de documento: Artigo Científico
• Fonte: Materials Letters; v. 189, p. 201-205, FEB 15 2017.
• Citações Web of Science: 1

Resumo

Herein, the fine-scaled a phase precipitation during step-quench heat treatments in Ti-15Nb-3.0Fe and Ti-11Nb-3.5Fe (wt%) alloys was evaluated. Thermodynamic analyses suggest that Ti-11Nb-3.5Fe alloy should present homogenous a phase formation via the pseudospinodal mechanism when solution treated and step-quenched at 450 degrees C, which is confirmed in this work. STEM-EDX measurements confirm the non-equilibrium state of the alpha phase precipitates, whose Nb content is significantly higher than that of the alpha phase laths obtained after solution heat treatment followed by furnace cooling. Fe seems to play an important role in the precipitation mechanism, and is depleted from alpha phase laths in a short aging time. (C) 2016 Elsevier B.V. All rights reserved. (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