Banca de QUALIFICAÇÃO: HELIMAR MARTINS DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : HELIMAR MARTINS DA SILVA
DATE: 30/03/2026
TIME: 14:00
LOCAL: Remota
TITLE:

Effect of different processing conditions on the microstructure and properties of the Ti-12Mo-8Nb alloy for biomedical applications

KEY WORDS:

Metallic biomaterials; molybdenum; niobium; titanium; microstructure; properties.

PAGES: 60
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Metalurgia Física
SPECIALTY: Propriedades Mecânicas dos Metais e Ligas
SUMMARY:

      This study is situated within the context of an aging population and the growing need for biomaterials for orthopedic and dental uses, due to increased life expectancy and the rise in the occurrence of osteoarticular diseases. In this context, it is essential to create implants with high durability, biocompatibility, and mechanical characteristics compatible with bone tissue. Among metallic biomaterials, titanium alloys stand out for their low density, high corrosion resistance, excellent mechanical properties, and remarkable biocompatibility, resulting from the spontaneous formation of a passive layer of titanium oxide (TiO₂). However, alloys frequently used in clinical practice, such as Ti-6Al-4V, have limitations associated with a high modulus of elasticity and the presence of potentially cytotoxic elements, such as aluminum and vanadium. This can exacerbate the "stress shielding" phenomenon and affect long-term biological performance. To overcome these limitations, recent studies have focused on the development of titanium β alloys with non-toxic elements such as molybdenum (Mo) and niobium (Nb). These elements act as β-phase stabilizers, contributing to a decrease in the elastic modulus and improving biomechanical compatibility with cortical bone. In this scenario, the Ti-12Mo-8Nb alloy emerges as a promising option for biomedical uses, as the inclusion of Mo and Nb helps stabilize the metastable β phase, in addition to assisting in the formation of microstructures that balance mechanical strength, deformability, and high corrosion resistance. Furthermore, the control of processing conditions and heat treatments has a direct impact on microstructural evolution, the β-phase fraction, and ultimately, the mechanical properties of these alloys. Thus, the objective of this study is to examine methods for determining mechanical properties, focusing on hardness and modulus of elasticity, in alloys of the Ti-XMo-XNb system, correlating microstructure and mechanical response. For this, characterization techniques will be used, such as X-ray diffraction (XRD), scanning electron microscopy (SEM/EDS), Vickers hardness tests and compressive strength. The goal is to contribute to the advancement in the development of safer and mechanically compatible metallic biomaterials with bone tissue.

COMMITTEE MEMBERS:
Presidente - ***.227.786-** - SINARA BORBOREMA - UERJ
Interno - 1723192 - ANTONIO RENATO BIGANSOLLI
Interna - 1210011 - BELMIRA BENEDITA DE LIMA KUHN
Externa à Instituição - ALINE RAQUEL VIEIRA NUNES - UERJ