Assessment of b stabilizers additions on microstructure and properties of as-cast b Ti-Nb based alloys

Author(s)

dos Santos, Rafael Formenton ; Rossi, Mariana Correa ; Vidilli, Andre Luiz ; Borras, Vicente Amigo ; Afonso, Conrado Ramos Moreira

• Document type: Journal article
• Source: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 22, p. 14-pg., 2023-01-12.

Abstract

The novelty of the present work lies in elucidating the correlation of Moeq with mechanical and surface parameters. The Ti-15Nb (TN-15), Ti-40Nb (TN-40), Ti-33Nb-33Zr (TNZ-33), Ti-40Nb-40Zr (TNZ40) and Ti-35Nb-7Zr-5Ta (TNZT) alloys were obtained by casting. The alloys were formed by b-Ti grains with a micrometric morphology, except the as-cast TN -15 alloy formed by a thorn b. Adding Nb and Zr influenced the lattice parameters of phase b, as well as the crystal structure. Grain size (GS) decreased adding Nb and Zr following this relation: TN-40 > TNZ-33>TNZT > TNZ40. The roughness decreased with rising Nb and Zr contents being in the range of 1.3-3 mm, and it was possible to correlate it with the Moeq. The contact angle and free energy surface values were inversely proportional, and the as -cast TNZ40 alloy with smaller GS was less wettable (60) than TN40 (GS: 1423 mm). The mechanical properties decreased to Moeq of 14.9 wt% then their significantly went above this value, except for the as-cast TN-15 alloy (E: 65 GPa, microhardness: 264 HV) formed mainly by a hardener phase a. Both elastic modulus and microhardness showed the same tendency as the Moeq values and the cell parameter of phase b (ab). The oxygen content was all in accordance with ASTM E1409-13 for applications as metallic biomaterials being in the range of 0.044-0.195 wt%.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). (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: 21/11537-1 - Processing and characterization of nanostructured lightweight steels reinforced with TiB2 by additive manufacturing and powder metallurgy
• Grantee: André Luiz Vidilli
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 21/03865-9 - Influence of surface modifications on bioactivity and (tribo) corrosion of beta Ti-Nb-(Zr) alloys with low elastic modulus for application as implant
• Grantee: Mariana Correa Rossi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral