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

• DOI: 10.1007/s11182-018-1592-2
• Publication Date: 2018-12-26T06:04:02Z
• Authors: Yu. P. Sharkeev; V. A. Skripnyak; V. P. Vavilov; E. V. Legostaeva; A. A. Kozulin; A. O. Chulkov; A. Yu. Eroshenko; O. A. Belyavskaya; V. V. Skripnyak; I. A. Glukhov
• Keywords: Hardening (computing); Titanium alloy; Strain hardening exponent

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.