Optimizing strength and corrosion resistance of the metastable β-alloy Ti-35Nb-7Zr-5Ta alloy by equal-channel angular pressing

Autor(es)

Silva, R. ; Silva, J. ; Viana, C. C. ; Afonso, C. R. M. ; Hammer, P. ; Magalhaes, D. C. C. ; Plaine, A. H. ; Rovere, C. A. D.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 35, p. 13-pg., 2025-01-26.

Resumo

Controlling the microstructure of the Ti-35Nb-7Zr-5Ta alloy is fundamental for enhancing its strength and corrosion resistance in biomedical applications. This study examines how microstructural evolution through equal-channel angular pressing (ECAP) at room temperature and 300 degrees C influences Young's modulus, hardness, and corrosion resistance. ECAP refines grain size and promotes nanocrystalline beta-phase grains, alpha" phase decomposition, and omega phase precipitation. Room temperature ECAP decreases Young's modulus by reducing the beta-phase stability due to deformation, while 300 degrees C processing enhances hardness and Young's modulus due to finer microstructure and higher omega-phase fraction. Grain refinement accelerates passivation kinetics, enhancing corrosion resistance with a thicker and less defective passive film, especially at 300 degrees C, without significant changes in the elemental composition of the outer passive film. (AU)

• Processo FAPESP: 18/18293-8 - Ligas de titânio: transformações de fases e manufatura aditiva aplicadas na obtenção de materiais com gradientes funcionais
• Beneficiário: Rubens Caram Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 23/03242-7 - Obtenção de chapas heteroestruturadas de Cu/Nb com propriedades mecânicas e funcionais otimizadas
• Beneficiário: Danielle Cristina Camilo Magalhães
• Modalidade de apoio: Auxílio à Pesquisa - Regular