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Non-classic Precipitation of Alpha Phase in Ti-Nb-Fe and Ti-Nb-Fe-Sn Alloys


Mechanical behavior of metastable beta-type titanium alloys can be manipulated by applying solution heat treatments of beta phase, followed by alpha phase precipitation. While beta phase is soft, alpha phase exhibits harder. Usually, it is assumed that the alpha phase nucleation in the beta phase matrix occurs heterogeneously and assisted by omega phase, which acts as nucleation substrate. The aim of this research project is to evaluate microstructure evolution and mechanical properties of Ti-Nb-Fe and Ti-Nb-Fe-Sn alloys submitted to aging heat treatment to verify whether alpha phase can be nucleated homogeneously and assisted by pseudo-spinodal decomposition. Ti-Nb-Fe and Ti-Nb-Fe-Sn alloys will be prepared by arc melting, subjected to solution heat treatment followed by plastic deformation and finally, applying aging heat treatments. Samples will be characterized by light microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, elastic modulus measurements, Vickers hardness and tensile tests. The results to be obtained will allow verifying the possibility of obtaining the pseudo-spinodal decomposition in Nb-based titanium alloys. (AU)

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Scientific publications (7)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
TAIPINA, MARCIA O.; DE MELLO, MARIANA G.; TAMBORLIN, LETICIA; PEREIRA, KARINA D.; LUCHESSI, AUGUSTO D.; CREMASCO, ALESSANDRA; CARAM, RUBENS. A novel Ag doping Ti alloys route: Formation and antibacterial effect of the TiO2 nanotubes. Materials Chemistry and Physics, v. 261, MAR 1 2021. Web of Science Citations: 0.
DE MELLO, MARIANA G.; COSTA, FERNANDO H.; OPINI, VICTOR; RESENDE, ARTHUR; CREMASCO, ALESSANDRA; CARAM, RUBENS. Isothermal omega Assisted Alpha Phase Precipitation and Microstructural Evolution of an Aged Ti-30Nb-3Fe Alloy. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 23, n. 3 2020. Web of Science Citations: 0.
FATICHI, ALBERTO Z.; MELLO, MARIANA G.; CARAM, RUBENS; CREMASCO, ALESSANDRA. Self-organized TiO2 nanotube layer on Ti-Nb-Zr alloys: growth, characterization, and effect on corrosion behavior. Journal of Applied Electrochemistry, v. 49, n. 11, p. 1079-1089, NOV 2019. Web of Science Citations: 1.
DE MELLO, MARIANA G.; SALVADOR, CAMILO A. F.; FANTON, LEONARDO; CARAM, RUBENS. High strength biomedical Ti-13Mo-6Sn alloy: Processing routes, microstructural evolution and mechanical behavior. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 764, SEP 9 2019. Web of Science Citations: 0.
DAL BO, MARIANA R.; SALVADOR, CAMILO A. F.; MELLO, MARIANA G.; LIMA, DALTON D.; FARIA, GUILHERME A.; RAMIREZ, ANTONIO J.; CARAM, RUBENS. The effect of Zr and Sn additions on the microstructure of Ti-Nb-Fe gum metals with high elastic admissible strain. MATERIALS & DESIGN, v. 160, p. 1186-1195, DEC 15 2018. Web of Science Citations: 3.
DE MELLO, MARIANA G.; DAINESE, BEATRIZ P.; CARAM, RUBENS; CREMASCO, ALESSANDRA. Influence of heating rate and aging temperature on omega and alpha phase precipitation in Ti-35Nb alloy. MATERIALS CHARACTERIZATION, v. 145, p. 268-276, NOV 2018. Web of Science Citations: 0.
OPINI, V. C.; CAMPO, K. N.; MELLO, M. G.; LOPES, E. S. N.; CARAM, R. Effect of partial replacement of V with Nb on phase transformations and mechanical properties of Ti-5553 alloy. Materials Letters, v. 220, p. 205-208, JUN 1 2018. Web of Science Citations: 1.

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