Effect of thermomechanical treatment on deformational behavior of ferromagnetic Fe–Ni–Co–Ti alloy under uniaxial tension
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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.
KeywordsFerromagnetic iron-based alloys Mechanical stresses Superelastic deformation Shape memory effect Thermomechanical treatment Nanoparticles Hysteresis Grain size
Shape memory effect
Shape memory alloy
Ferromagnetic shape memory alloy
Scanning electron microscope
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.
Compliance with ethical standards
Conflict of interest
The authors declare that none of the authors have any competing interests in the manuscript. On behalf of all authors, the corresponding author states that there is no conflict of interest.
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