Agradecimentos: The authors gratefully acknowledge LNNano/CNPEM (National Nanotechnology Laboratory of the National Center for Research on Energy and Materials) for providing access to its SEM/TEM facilities; as well as the Brazilian research funding agencies FAPESP (São Paulo Research Foundation, Grants #2016/24693-3 and Grants #2014/00159-2) and CNPq (National Council for Scientific and Technological Development, Grant # 405054/2016-5) for their financial support Ver menos

Metastable β Ti alloys based on Nb exhibit features that make them suitable for load-bearing biomedical applications, so it is crucial to evaluate their phase transformation and properties. This paper discusses the effects of aging heat treatments on the microstructure, phase transformation and mechanical behavior of Tisingle bond35Nb alloy. Samples were solution heat treated in the β field, quenched and aged under different conditions of heating rates, isothermal aging temperature and isothermal aging time. To enhance the alloy's mechanical behavior, thermal analysis and high temperature X-ray diffraction experiments coupled with Vickers hardness tests were employed to determine the temperature range of isothermal ω phase precipitation, as well as α phase precipitation temperature, thereby providing information to optimize aging heat treatment conditions. Results indicate that Tisingle bond35Nb alloy subjected to a heating rate of 30 °C/min and an isothermal aging temperature of 500 °C applied for 4 h would ensure high mechanical strength and low elastic modulus. The application of these aging conditions led to a microstructure consisting of very refined α phase precipitates homogeneously dispersed in the β phase matrix, presenting an ultimate tensile strength of 972 MPa, elongation of 7.5% and elastic modulus of 78 GPa, making this aged alloy a promising candidate for biomedical applications. These results shed light on the correlations between phase transformations, microstructure and mechanical behavior in high solute content Tisingle bondNb alloys for biomedical applications Ver menos