Special Aspects of Microstructure, Deformation and Fracture of Bioinert Zirconium and Titanium-Niobium Alloys in Different Structural States

• Published in: Russian physics journal 2019-01, Vol.61 (9), p.1718-1725
• Main Authors: Sharkeev, Yu. P., Skripnyak, V. A., Vavilov, V. P., Legostaeva, E. V., Kozulin, A. A., Chulkov, A. O., Eroshenko, A. Yu, Belyavskaya, O. A., Skripnyak, V. V., Glukhov, I. A.
• Format: Article
• Language: English
• Subjects: Condensed Matter Physics; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DEFORMATION; FRACTURES; Hadrons; Heavy Ions; Lasers; Mathematical and Computational Physics; MECHANICAL PROPERTIES; MICROSTRUCTURE; NIOBIUM ALLOYS; Nuclear Physics; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; STRAIN HARDENING; STRAINS; Stress-strain curves; Stress-strain relationships; STRESSES; Theoretical; TITANIUM ALLOYS; Titanium base alloys; Ultrafines; ZIRCONIUM ALLOYS
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-018-1592-2

The characteristics of microstructure, deformation and fracture of Zr – 1 wt% Nb and Ti – 45 wt% Nb bioinert alloys in the coarse- and ultrafine-grained states are investigated. It is shown that the ultrafine-grained structure formed in them ensures excellent mechanical properties of the alloys and affects the stages of the stress-strain curves and the behavior of the maximum temperature vs. deformation time plot. The formation of an α-phase in the Ti – 45 wt% Nb ultrafine-grained alloy suppresses the linear stage VI characterized by a constant strain hardening coefficient. In stage VII, the strain hardening coefficient rapidly becomes negative, which indicates the material softening prior to its failure.