Influence of Zr Content in Ti-40Nb-xZr Alloys on the Microstruture, Elastic Modulus and Microhardness

Author(s)

dos Santos, Rafael Formenton Macedo ; Reis, Carolina Neves ; Afonso, Conrado Ramos Moreira

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 26, p. 6-pg., 2023-01-01.

Abstract

In recent years, there has been a growing interest in the search for metallic alloys with favorable mechanical and chemical characteristics that elicit a positive biological response. Among these alloys, ss-Ti alloys have attracted significant attention due to their low elastic modulus and excellent biocompatibility. The addition of Nb contributes to stabilizing the ss phase at room temperatures, leading to the transformation of ss into ss + alpha (ss-isomorph). Additionally, despite Zr being commonly considered a neutral element, it can exhibit a ss-stabilizing characteristic when combined with betagenic elements. Both Nb and Zr have been shown to effectively increase the lattice parameter of the ss phase, which is advantageous for reducing the elastic modulus. The primary objective of this study was to characterize ss-Ti alloys within the Ti-Nb-Zr system, specifically Ti-40Nb-20Zr, Ti-40Nb-30Zr, and Ti-40Nb-40Zr (wt.%) produced via arc furnace casting. The study aimed to investigate the influence of the proportion of ss-stabilizing or betagenic elements on the microstructure and properties of the alloys, including Vickers microhardness and elastic modulus. (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: 20/12431-0 - Characterization of multicomponent beta titanium alloys with low elastic modulus
• Grantee: Carolina Neves Reis
• Support Opportunities: Scholarships in Brazil - Scientific Initiation