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Phase transformations, microestructure and mechanical properties of new beta metastable Ti-Nb-Zr-Fe (TNZF) titanium alloys for biomedical applications

Grant number: 14/24449-0
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): April 01, 2015
Effective date (End): April 06, 2019
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal Investigator:Rubens Caram Junior
Grantee:Camilo Augusto Fernandes Salvador
Host Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated scholarship(s):16/22714-3 - Fe-activated formation of pseudospinodal alpha phase in TiNbFe based alloys, BE.EP.DR


During the last decade, rare and high melting point metals (Nb, Ta and Zr) have been widely used as alloying elements for biomedical titanium alloys, as pointed out in the TNZT-O (Ti-36Nb-2Ta-3Zr-0,3O wt.%) composition developed by Saito, 2003. These elements, however, are costly and difficult to process. The combination of low cost metals, such as Mn, Fe or Sn, with classical beta stabilizer elements, such as Nb, is an important vector for the development of new biomedical alloys, with desirable mechanical properties for bioimplants. This work deals with the study of new Ti-Nb-Zr-Fe alloys, concerning phase transformations, aging heat treatments and mechanical properties. Eight alloys of Ti-Nb-Fe and Ti-Nb-Fe-Zr systems will be prepared via arc melting, under controlled atmosphere. The samples will be homogenized at temperatures above beta transus, hot rolled and submitted to different heat treatments, varying cooling rate, temperature and time. Then, the samples will be analyzed by X-ray diffraction, differential scanning calorimetry, scanning electron microscopy and transmission electron microscopy. The aim of this work is to understand the influence of iron as either tertiary or quaternary element, partially substituting Nb, on the phase transformation events and mechanical properties of these novel alloys. Their compositions were determined with aid of the electronic parameters proposed by Morinaga, 1998. By the end of this work, it is expected to develop an optimal composition of the Ti-Nb-Zr-Fe system, with relative low cost and excellent mechanical properties.

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Scientific publications (5)
(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)
SALVADOR, CAMILO A. F.; LOPES, EDER S. N.; BETTINI, JEFFERSON; CARAM, RUBENS. Formation of alpha phase via pseudospinodal decomposition in Ti-Nb-Fe based alloys. Materials Letters, v. 189, p. 201-205, . (14/24449-0, 14/06099-1)
SALVADOR, CAMILO A. F.; DAL BO, MARIANA R.; LIMA, DALTON D.; MIRANDA, CAETANO R.; CARAM, RUBENS. Experimental and computational investigation of Ti-Nb-Fe-Zr alloys with limited Fe contents for biomedical applications. Journal of Materials Science, v. 56, n. 19, p. 11494-11510, . (14/24449-0)
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)
SALVADOR, CAMILO A. F.; DAL BO, MARIANA R.; COSTA, FERNANDO H.; TAIPINA, MARCIA O.; LOPES, EDER S. N.; CARAM, RUBENS. Solute lean Ti-Nb-Fe alloys: An exploratory study. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 65, p. 761-769, . (14/24449-0, 14/06099-1)
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)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SALVADOR, Camilo Augusto Fernandes. Transformações de fase, microestrutura e propriedades mecânicas de novas ligas de titânio beta metaestáveis do sistema Ti-Nb-Zr-Fe (TNZF) para aplicação biomédica. 2019. Doctoral Thesis - Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica Campinas, SP.

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