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Updated: Dec 12, 2025

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
Published on: July 28, 2020
Exceptionally high strain-hardening and ductility due to transformation induced plasticity effect in Ti-rich
Rajeshwar R Eleti1, Margarita Klimova2, Mikhail Tikhonovsky3
1Laboratory of Bulk Nanostructured Materials, Belgorod National Research University, Pobeda 85, Belgorod, Russia, 308015. rajeshwar.eleti@gmail.com.
Abstract:
Ti-rich body-centered cubic (BCC, β) high-entropy alloys having compositions Ti35Zr27.5Hf27.5Nb5Ta5, Ti38Zr25Hf25Ta10Sn2, and Ti38Zr25Hf25Ta7Sn5 (in at%) were designed using bond order (Bo)-mean d-orbital energy level (Md) approach. Deformation mechanisms of these alloys were studied using tensile deformation. The alloys showed exceptionally high strain-hardening and ductility. For instance, the alloys showed at least twofold increment of tensile strength compared to the yield strength, due to strain-hardening. Post-deformation microstructural observations confirmed the transformation of β to hexagonal close packed (HCP, α') martensite. Based on microstructural investigation, stress-strain behaviors were explained using transformation induced plasticity effect. Crystallographic analysis indicated transformation of β to α' showed strong variant selection (1 1 0)β//(0 0 0 1)α', and [1 - 1 1]β//[1 1 - 2 0]α'.
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