Nanocomposites and nanomaterials
Inelasticity of nanocomposite based on Fe-Ni-Co-Ti ferromagnetic alloy after thermomechanical treatment
Titenko A.1, Demchenko L.2, Babanli M.3, Kozlova L.1, Huseynov S.3
1 Institute of Magnetism of the NAS and MES of Ukraine,  36-b, Vernadskoho Blvd., Kyiv 03142, Ukraine
2 National Technical University of Ukraine "Kyiv Polytechnic Institute", 37, Peremohy Ave., Kyiv 03056, Ukraine
E-mail: lesyademch@gmail.com
3 Azerbaijan State University of Oil and Industry, Azadliq Ave., 20, Baku, AZ1010, Azerbaijan
This paper presents the results of mechanical tests at a uniaxial tension of a nanocomposite obtained as a result precipitation hardening in the process of ageing of quenched ferromagnetic Fe-27.2% Ni-17.4% Co-5.2% Ti (wt%) alloy having the martensitic, austenitic or mixed structure of matrix after cooling and/or applied stress. To obtain the nanocomposite, the alloy samples were subjected to a preliminary thermomechanical treatment (TMT), which consisted of multiple drawing operations, followed by quenching in water from 1373 K and ageing at 923 K for 5, 10, 20 minutes.
As a result of such TMT, a sufficiently high level of superelastic deformation and shape memory effect were achieved in [1, 2]. It was experimentally established that the preliminary TMT, consisting of drawing with compression degree 7.4÷22.5%, followed by quenching and aging at 923 K for 5÷10 minutes, favours the deformation of the nanocomposite along the channels of phase and twinning plasticity in the range of testing temperature Ms<T<Af and corresponds to the optimal combination of maximum superelastic strain and shape memory effect. A further increase in the degree of deformation results in inhibition of martensitic transformation and reducing of superelastic deformation by decreasing the austenite grain size and increasing the density of crystal defects.
1.	Titenko A.N., Demchenko L.D. Superelastic Deformation in Polycrystalline Fe-Ni-Co-Ti-Cu Alloys // J Mater Eng Perform. - 2012. - 21, N 12. -P. 2525-2529.
2.	Titenko A., Demchenko L., Kozlova L., Babanli M. Effect of Thermomechanical Treatment on Mechanical Properties of Ferromagnetic Fe-Ni-Co-Ti Alloy // Proceedings of the International Conference on Martensitic Transformations: Chicago - 2018. - P. 115-120.