Microstructure Evolution and Properties of Metastable Beta Titanium Alloys of the Ti-Nb-Fe Alloys

• Grant number: 13/13867-2
• Support Opportunities: Scholarships in Brazil - Master
• Start date: November 01, 2013
• End date: July 31, 2015
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Extractive Metallurgy
• Principal Investigator: Rubens Caram Junior
• Grantee: Fernando Henrique da Costa
• Host Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The mechanical behaviors of titanium alloys can be manipulated by means of application of heat treatments to metastable microstructures. In the case of metastable beta-type titanium alloys, application of solution and aging heat treatments results in the controlled precipitation of the alpha phase, with hexagonal close-packed structure and high mechanical strength, in the beta matrix phase, with body-centered cubic structure and high ductility. The alpha phase precipitation is a complex phenomenon that involves the omega phase acting as nucleation substrate. This study aims to evaluate the microstructural evolution and mechanical properties of alloys of the Ti-Nb-Fe system subjected to aging heat treatments. It will be developed by using the "Molecular Orbital Theory" to define metastable beta-type alloy compositions, followed by sample preparation in arc furnace under controlled atmosphere, forming, solution at high temperatures, rapid cooling to room temperature and application of aging heat treatments. The samples will be characterized by optical microscopy, scanning electron microscopy, X-ray diffraction, differential scanning calorimetry (DSC), Vickers hardness and tensile tests.

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)

DA COSTA, FERNANDO HENRIQUE; SALVADOR, CAMILO A. F.; DE MELLO, MARIANA G.; CARAM, RUBENS. Alpha phase precipitation in Ti-30Nb-1Fe alloys - phase transformations in continuous heating and aging heat treatments. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 677, p. 222-229, NOV 20 2016. (13/13867-2, 14/06099-1)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

COSTA, Fernando Henrique da. Microstructural evolution and mechanical properties of metastable beta titanium alloys in the Ti-Nb-Fe system. 2015. Master's Dissertation - Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica Campinas, SP.