| Texto completo | |
| Autor(es): |
Schumacher, Yasmin Monteiro
;
Grandini, Carlos Roberto
;
De Almeida, Gerson Santos
;
Zambuzzi, Willian Fernando
;
Kuroda, Pedro Akira Bazaglia
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | METALS; v. 15, n. 11, p. 22-pg., 2025-10-28. |
| Resumo | |
The objective of this study was to develop novel alloys of the Ti-15Nb-xTa system (x = 0, 10, 20, and 30 wt.%) and to evaluate the effect of tantalum addition on the structure, microstructure, hardness, and elastic modulus for biomedical applications. The ingots were produced using an arc melting furnace under a controlled argon atmosphere. Chemical composition analyses were performed using energy-dispersive spectroscopy (EDS) to determine the alloying element fractions and to conduct chemical mapping. The Thermo-Calc software was employed to predict the influence of Ta on the phase transformation temperatures. Structural and microstructural characterizations were performed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD patterns enabled the identification of the phases, the relative volume fractions, and the lattice parameters of the unit cells. As mechanical properties, Vickers microhardness and elastic modulus were measured. The results revealed that increasing Ta content decreased the beta-transus temperature but increased the melting temperature of the alloys. Structural and microstructural characterizations indicated that the Ti-15Nb alloy consisted of alpha ' + alpha '' phases, Ti-15Nb-10Ta of alpha '' + beta phases, Ti-15Nb-20Ta of alpha '' + beta + omega phases, and Ti-15Nb-30Ta of metastable beta phase. Hardness and elastic modulus results exhibited similar behavior: the alloy with the highest fraction of the alpha '' phase (Ti-15Nb-10Ta) displayed the lowest hardness and elastic modulus, whereas the alloy containing the omega phase (Ti-15Nb-20Ta) presented significantly higher values. Among the studied alloys, Ti-15Nb-10Ta stands out due to its low elastic modulus (57 GPa). In vitro cellular assays demonstrated that Ti-15Nb-Ta alloys promote osteoblast proliferation while exhibiting no cytotoxicity. (AU) | |
| Processo FAPESP: | 22/15157-1 - Hipóxia induzida por cobalto como estratégia biomimética para o desenvolvimento de biomateriais avançados |
| Beneficiário: | Willian Fernando Zambuzzi |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 24/03886-4 - "Da bioinspiração à inovação: repertório de moléculas bioativas fisioestruturais do osso como guia para o desenvolvimento de produtos biomiméticos" |
| Beneficiário: | Gerson Santos de Almeida |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 24/01132-2 - Centro Multidisciplinar para o Desenvolvimento de Tecnologia Assistiva (CMDTA) |
| Beneficiário: | Carlos Roberto Grandini |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Ciência para o Desenvolvimento |