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Effect of thermomechanical treatment on deformational behavior of ferromagnetic Fe–Ni–Co–Ti alloy under uniaxial tension


To improve the functional properties of a ferromagnetic shape memory alloy, a thermomechanical treatment that includes drawing followed by quenching and high-temperature annealing was proposed, as a result of which a nanostructured state is formed. Thermomechanical treatment (TMT) increases the alloy thermoelasticity, although it is accompanied by a large temperature hysteresis of martensitic transformation and results in a significant hardening of the matrix, which, in its turn, enlarges the effects of shape memory and superelasticity (or pseudoelasticity). It has been established that TMT of Fe–Ni–Co–Ti shape memory alloy contributes to an increase in reversible superelastic deformation up to ~ 3%. In a superelastic cycle with wide mechanical hysteresis, a large dissipation energy per loading–unloading cycle was gained, that favors the use of this alloy as a damper of mechanical oscillations.

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Shape memory


Shape memory effect


Shape memory alloy


Ferromagnetic shape memory alloy


Thermomechanical treatment


Scanning electron microscope




Martensitic transformations


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This research was supported by the laboratories of the Institute of Magnetism and the National Technical University of Ukraine “KPI” of the National Academy of Sciences of Ukraine and the Ministry of Education and Science of Ukraine.

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Correspondence to L. D. Demchenko.

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Titenko, A.N., Demchenko, L.D., Babanli, M.B. et al. Effect of thermomechanical treatment on deformational behavior of ferromagnetic Fe–Ni–Co–Ti alloy under uniaxial tension. Appl Nanosci 9, 937–943 (2019).

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  • Ferromagnetic iron-based alloys
  • Mechanical stresses
  • Superelastic deformation
  • Shape memory effect
  • Thermomechanical treatment
  • Nanoparticles
  • Hysteresis
  • Grain size