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.
News published in Agência FAPESP Newsletter about the scholarship: