A β Ti–20Nb–10Ta–5Zr Alloy with the Surface Structured on the Micro- and Nanoscale

• Published in: Doklady. a journal of the Russian Academy of Sciences. Physics Vol. 66; no. 1; pp. 14 - 16
• Main Authors: Sevostyanov, M. A., Baikin, A. S., Kaplan, M. A., Kolmakov, A. G., Gudkov, S. V., Rebezov, M. B., Garnov, S. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2021; Springer Nature B.V
• Subjects: Classical Mechanics; Crystal lattices; Cubic lattice; Elongation; Mathematical and Computational Physics; Modulus of elasticity; Physics; Physics and Astronomy; Tantalum; Tensile strength; Theoretical; Titanium; Zirconium; titanium alloy; nanotopology; optical micrograph; microstructural analysis
• ISSN: 1028-3358; 1562-6903
• DOI: 10.1134/S1028335821010079

This alloy is shown to be homogeneous (Ti 65%, Nb 20%, Ta 10%, Zr 5%). A change in the elemental composition is observed only in the layer close to the surface with a thickness of about 100 nm. The alloy surface is depleted in titanium (∼20%) and enriched in tantalum (∼20%). There is also a large amount of oxides on the surface (∼50%). The alloy is single-phase with a β-Ti-type crystal lattice (cubic system, space group
Im3m
). The alloy has yield strength of about 550 MPa and a tensile strength of about 700 MPa. The Young’s modulus is about 50 GPa. The relative elongation of the alloy is about 1.4%. On a microscale, folds and longitudinal comb-like structures up to 0.5 μm in height are found on the surface of wires and plates made of the Ti–20Nb–10Ta–5Zr alloy. When analyzing nanotopology, it is found that, even between comb-like structures or at their tops, there are irregularities up to 100–150 nm in height.