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

Author(s)

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

• Document type: Journal article
• Source: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 35, p. 13-pg., 2025-01-26.

Abstract

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)

• FAPESP's process: 18/18293-8 - Titanium alloys: phase transformations and additive manufacturing applied to obtaining functionally graded materials
• Grantee: Rubens Caram Junior
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 23/03242-7 - Obtaining Cu/Nb heterostructured sheets with mechanical and functional properties optmized
• Grantee: Danielle Cristina Camilo Magalhães
• Support Opportunities: Regular Research Grants