Nanocomposites and nanomaterials

Influence of thermomechanical treatment on mechanical and magnetic behavior of Fe-Ni-Co-Ti alloy
A. Titenko1, L. Demchenko2, A. Perekos3, M. Babanli4, Yu. Troschenkov1, Ya. Titenko2, S. Huseynov4
1 Institute of Magnetism, NAS and MES of Ukraine, 36-b, Vernadskoho Blvd., Kyiv 03142, Ukraine
2 National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", 37, Peremohy Ave., Kyiv 03056, Ukraine
E-mail: lesyademch@gmail.com
3 G. V. Kurdyumov Institute for Metal Physics of the NAS of Ukraine, 36, Vernadskoho Blvd., Kyiv 03142, Ukraine
4 Azerbaijan State University of Oil and Industry, Azadliq Ave., 20, Baku, AZ1010, Azerbaijan

Ferromagnetic shape memory alloys have unique functional properties that are manifested in the unusual mechanical and magnetic behaviour under thermal, mechanical, magnetic influence. To improve the functional properties, a thermomechanical treatment (TMT) was proposed, as a result of which a nanostructured state was formed and a sufficiently high level of superelastic deformation and shape memory effect was achieved [1]. 
The paper presents the study of the effect of thermomechanical treatment on mechanical and magnetic behaviour of the polycrystalline ferromagnetic Fe–Ni–Co–Ti alloy. It was established that preliminary TMT, consisting of drawing followed by quenching then ageing, corresponds to optimal combination of superelastic strain and shape memory effect. The change in the alloy magnetic characteristics depending on certain preliminary TMT is associated with a decrease in the volume fraction of the ferromagnetic phase under ageing and the formation of a system of microinhomogeneities in material that results in the appearance of additional induced magnetic anisotropy under both thermomechanical treatment and tensile test.

1.	Titenko A.N., Demchenko L.D., Babanli M.B., Sharai I.V., Titenko Ya.А. Effect of thermomechanical treatment on deformational behavior of ferromagnetic Fe-Ni-Co-Ti alloy under uniaxial tension // Applied Nanoscience. - 2019. - https://doi.org/10.1007/s13204-019-00971-0