Nanocomposites and nanomaterials

The  effect  of  nanoparticles  on  magnetic  behavior  of  aged Cu-Al-Mn-Fe alloys
Titenko A.1, Demchenko L.2, Babanli M.3, Troshchenkov Yu.1, Huseynov S.3

1 Institute of Magnetism of the NAS and the 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 Azerbaijan State University of Oil and Industry, Azadliq Ave., 20, Baku, AZ1010, Azerbaijan

Cu-Al-Mn alloys, in addition to their good functional properties such as ductility, superelasticity, shape memory effect, and high damping abilities, exhibit a diverse magnetic behavior depending on aging conditions. As a result of aging, equiaxial ferromagnetic nanosized particles of Cu2(Mn,Fe)Al precipitate in this system, which also contributes to an increase in the thermoelasticity of the alloys with a decrease in the width of the temperature hysteresis [1]. Regarding magnetic properties, depending on the size and location of particles, the alloys of this system can exhibit superparamagnetic, ferromagnetic and antiferromagnetic ordering.
In the work, we studied the effect of interaction and distribution of ferromagnetic nanoparticles in Cu–Al–Mn-Fe alloy. Samples preparation was carried out as follows: homogenizing annealing at 850C for 10 hours, quenching in water from 850C, after that isothermal aging was performed at temperatures of 100, 150 and 200C of various durations from 0.5 to 5 hours. A feature of the alloy structural state is a large size of austenite grain.
By measuring static magnetization and low-field magnetic susceptibility, the nature of the interaction of precipitated ferromagnetic particles depending on their volume fraction and size was established.
The magnetic characteristics of the alloys have the same type of behavior, and the difference lies only in quantitative estimates, namely, the volume fraction of ferromagnetic nanoparticles and their sizes.

1.	Titenko A., Demchenko L., Perekos A., Gerasimov O. Effect of thermomagnetic treatment on structure and properties of Cu–Al–Mn alloy // Nanoscale Res Lett. – 2017. - 12.-P. 285