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Fe-activated formation of pseudospinodal alpha phase in TiNbFe based alloys

Grant number: 16/22714-3
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): March 13, 2017
Effective date (End): March 12, 2018
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal Investigator:Rubens Caram Junior
Grantee:Camilo Augusto Fernandes Salvador
Supervisor: Hamish L. Fraser
Host Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Research place: Ohio State University, Columbus, United States  
Associated to the scholarship:14/24449-0 - Phase transformations, microestructure and mechanical properties of new beta metastable Ti-Nb-Zr-Fe (TNZF) titanium alloys for biomedical applications, BP.DR


In this project, we aim to investigate the pseudospinodal formation of alpha phase in Ti-Nb-Fe based alloys. The Ti-Nb-Fe ternary system is a relatively low cost system with potential for many future applications. Thermodynamic analyses suggest that properly designed compositions of this system should present homogeneous alpha phase formation when solution-treated and step-quenched to temperatures near 450°C. Such proposition has been the subject of one of our recent works; however, the topic is still open for further interpretations - i.e. a detailed analysis of multiple aging times is required. Additionally, previous studies indicate that other aspects of alpha phase precipitation are controversial in this system: besides having a strong beta-stabilizing effect, Fe accelerates the alpha phase formation during quench-and-aging heat treatments while restricts alpha phase size. Current limitations of the Ti-Nb-Fe system are the relatively high elastic modulus resultant of Fe addition (higher than 80 GPa) and the limited cold-forming ability of the Fe-rich alloys. Many challenges lie ahead. Thereupon, we also aim to investigate the addition of Zr to the Ti-Nb-Fe system to overcome these limitations and improve the microstructure control. Analyzing the solute redistribution during aging in ternary Ti-Nb-Fe and quaternary Ti-Nb-Fe-Zr alloys will be crucial to identify in which conditions the pseudospinodal decomposition actually takes place. It is worth reminding there are no precedents in the literature reporting pseudo-spinodal transformations in Ti-Nb-Fe based alloys. (AU)

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Scientific publications
(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)
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, . (14/24449-0, 16/22714-3, 16/24693-3)
SALVADOR, CAMILO A. F.; OPINI, VICTOR C.; MELLO, MARIANA G.; CARAM, RUBENS. Effects of double-aging heat-treatments on the microstructure and mechanical behavior of an Nb-modified Ti-5553 alloy. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 743, p. 716-725, . (14/24449-0, 16/22714-3)

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