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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 type:Scholarships in Brazil - Doctorate
Effective date (Start): April 01, 2015
Effective date (End): April 06, 2019
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal Investigator:Rubens Caram Junior
Grantee:Camilo Augusto Fernandes Salvador
Home 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

Abstract

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.

Scientific publications (4)
(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.; 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, JAN 16 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: 2.
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, FEB 15 2017. Web of Science Citations: 1.
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, JAN 2017. Web of Science Citations: 4.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.