Impacts of the alloying elements and thermo-mechanical processing on the phase stability, crystalline structure, microstructure, and selected mechanical properties of Ti-(10-x)Al-xV (x = 0, 2, and 4 wt%) alloys targeted as external prostheses

Autor(es)

Pinto, Bruna O. ; Torrento, Jhuliene E. M. ; Kuroda, Pedro A. B. ; Correa, Mariana R. ; Grandini, Carlos R. ; Zambuzzi, William F. ; Rau, Julietta V. ; Fosca, Marco ; Correa, Diego R. N.

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS TODAY COMMUNICATIONS; v. 41, p. 11-pg., 2024-12-01.

Resumo

This study aimed to characterize Ti-Al-V alloys submitted to thermo-mechanical processes and evaluate their impact on the crystalline structure, microstructure, coefficient of thermal expansion (CTE), selected mechanical properties, and cytotoxicity. X-ray diffraction (XRD) analysis revealed a major alpha phase, with V acting as a beta-stabilizer. The cooling rate and the plastic deformation contributed to the formation of minor martensitic alpha ' and beta phases, with notable variations in cell parameters. The Energy-Dispersive XRD indicated the CTE was dependent on the alloying elements. Ti-10Al and Ti-8Al-2V depicted Widmansta<spacing diaeresis>tten laths and basket-weave structures, while Ti-6Al-4V showed typical features of beta grain boundaries. Thermodynamic predictions aligned with the observed phase compositions. Vickers micro-hardness tests yielded values surpassing those of commercially pure titanium (CP-Ti), attributed to the synergistic effects of solid solution, phase precipitation, and strain hardening effects. And, elastic modulus approximated that of CP-Ti, largely due to the alpha phase's predominance. The solution treatment reduced the elastic modulus compared to the hot-rolled samples due to the stress relief and alpha ' and beta phase precipitation. Preliminary cytotoxicity assays confirmed the non-toxicity of the samples to cell viability. These findings suggest that the solutionized Ti-10Al sample is an economically viable candidate for fabricating external prostheses. (AU)

• Processo FAPESP: 21/13921-3 - Desenvolvimento de uma liga de alta entropia de baixo custo para potencial aplicação como dispositivos de fixação óssea
• Beneficiário: Jhuliene Elen Muro Torrento
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/24931-7 - Desenvolvimento de uma nova liga de alta entropia à base de TiZrNbTaMn para potencial aplicação biomédica
• Beneficiário: Jhuliene Elen Muro Torrento
• Modalidade de apoio: Bolsas no Brasil - Mestrado