Influence of ultrafine-grained structure of Ti-42Nb-7Zr alloy on energy dissipation and storage under quasi-static tension

• Published in: Materials letters Vol. 375; p. 137241
• Main Authors: Legostaeva, E.V., Eroshenko, A. Yu, Vavilov, V.P., Skripnyak, V.A., Uvarkin, P.V., Tolmachev, A.I., Bataev, V.A., Chulkov, A.O., Kozulin, A.A., Skripnyak, V.V., Sharkeev, Yu. P.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-11-2024
• Subjects: Energy dissipation and storage; Infrared thermography; Microstructure; Severe plastic deformation; Tensile test; Ultrafine-grained alloy; Infrared thermography; Severe plastic deformation; Ultrafine-grained alloy; Microstructure; Energy dissipation and storage; Tensile test
• ISSN: 0167-577X
• DOI: 10.1016/j.matlet.2024.137241

•Effect of ultrafine-grained (UFG) state on strain behavior of Ti-42Nb-7Zr is studied.•Substructural strengthening and dispersion hardening change energy dissipation.•Initial stage with constant temperature is 1.75 times higher for UFG state.•Heat energy before UFG alloy fracture is 2 times larger than the stored energy.•Fracture of UFG alloy occurs along large-, low-angle grain boundaries and fragments.
The ultrafine-grained (UFG) structure and plastic deformation of the Ti-42Nb-7Zr alloy have been investigated using infrared thermography. The initial stage occurs at a constant temperature when the total energy of plastic strain absorbed by the alloy is 1.75 times higher for the UFG alloy, than for the alloy with a coarse-grained structure. This fact is due to substructural strengthening caused by severe plastic deformation and dispersion hardening with ω-phase nanoparticles. The amount of heat released before the UFG alloy fracture is 2 times larger than the amount of stored energy, and this results in localized softening of the UFG alloy prior to its fracture.