Journal
APPLIED NANOSCIENCE
Volume 9, Issue 5, Pages 937-943Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13204-019-00971-0
Keywords
Ferromagnetic iron-based alloys; Mechanical stresses; Superelastic deformation; Shape memory effect; Thermomechanical treatment; Nanoparticles; Hysteresis; Grain size
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Funding
- National Technical University of Ukraine KPI of the National Academy of Sciences of Ukraine
- Ministry of Education and Science of Ukraine
- laboratories of the Institute of Magnetism
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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 similar 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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