New correlation between elastic modulus and composition of multiprincipal ternary β Ti-Nb-Zr-based alloys

Author(s)

dos Santos, Rafael Formenton Macedo ; Kuroda, Pedro Akira Bazaglia ; Contieri, Rodrigo Jose ; Afonso, Conrado Ramos Moreira

• Document type: Journal article
• Source: Journal of Materials Research; v. N/A, p. 12-pg., 2025-01-13.

Abstract

Despite significant advances in beta-Ti (BCC) alloys, challenges persist in optimizing alloy compositions and methodologies to improve implant performance. Conventional alloys, such as Ti-6Al-4V and 316L stainless steel, exhibit limitations in biocompatibility and mechanical compatibility due to their high elastic modulus, leading to stress-shielding effects. To mitigate these issues, a novel predictive model, beta(LEM), has been introduced, targeting alloys with reduced elastic modulus, initially focusing on Ti-Nb-Zr systems. Zirconium has been shown to stabilize the beta phase by reducing the titanium content and increasing niobium concentration, resulting in a decrease in the elastic modulus. The Ti-40Nb-40Zr alloy (40Zr) exhibited a reduced modulus of 42 GPa in the hot-rolled state, compared to 63 GPa in the as-cast state. The beta(LEM) model demonstrated an inverse relationship between lattice parameter and elastic modulus, highlighting the potential of Zr-rich alloys in enhancing mechanical compatibility for biomedical applications. (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: 24/02047-9 - Production of Multiprincipal Beta Ti-33Nb-33Zr Alloy through Arc Melting, Laser Additive Manufacturing and Severe Plastic Deformation
• Grantee: Conrado Ramos Moreira Afonso
• Support Opportunities: Regular Research Grants
• FAPESP's process: 23/16836-2 - Multiuser Platform for obtaining Powders through Ultrasonic Atomization and 3D Printing of Titanium Alloys, multiprincipal and refractory for Biomedical and Advanced Applications.
• Grantee: Conrado Ramos Moreira Afonso
• Support Opportunities: Research Infrastructure Program - Small Medium Sized