Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7994382 | Journal of Alloys and Compounds | 2018 | 16 Pages |
Abstract
In this preliminary study, a novel combination of radial shear rolling with thermomechanical treatment including cold rolling and post-deformation annealing at different temperatures was applied to Ti-18Zr-14Nb shape memory alloy with the objective of forming various structures in long-length bars dedicated for bone implants fabrication. The static mechanical properties and the functional fatigue behavior of Ti-18Zr-14Nb alloy in different structural states were studied. The dynamically polygonized substructure of β-phase formed as a result of radial shear rolling led to an outstanding combination of high ductility (δ = 35%) and superior functional fatigue resistance. After additional TMT (CR e = 0.3 + PDA at 500 °C), the alloy exhibited a highly-dislocated nanosubgrained structure of β-phase with subgrain size below 100 nm and a small quantity of α-phase. PDA at 550 °C led to the formation of the polygonized structure in β-phase with nano-to submicrometer-sized subgrains without α-phase present. The latter TMT improved further the functional properties of the alloy, by increasing its strength-to-modulus ratio and ensuring stable functional fatigue behavior with low level of accumulated strain.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
V. Sheremetyev, A. Kudryashova, S. Dubinskiy, S. Galkin, S. Prokoshkin, V. Brailovski,