Nanocomposites and nanomaterials

The effect of Fe-dopant on  magnetic and structural features of aged Cu-Al-Mn(Fe) alloys
Demchenko L.1, Titenko A.2, Bykanov T.1, Titenko O.1, Babanli M.3, Troshchenkov Yu.2, Huseynov S.3
1 National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", 37, Peremohy Ave., Kyiv 03056, Ukraine.
E-mail: lesyademch@gmail.com
2 Institute of Magnetism of the NAS and the MES of Ukraine, 36-b, Vernadskoho Blvd., Kyiv 03142, Ukraine.
3 Azerbaijan State University of Oil and Industry, Azadliq Ave., 20, Baku, AZ1010, Azerbaijan

Some of the Cu-Al-Mn alloys can exhibit magnetic properties depending on aging, in addition to their functional properties: ductility, superelasticity, shape memory effect, high damping capacity. In this system, ferromagnetic nanosized particles of Cu2(Mn,Fe)Al are precipitated as a result of aging, which contributes to an increase in the thermoelasticity of alloys associated with a decrease in the width of the temperature hysteresis [1]. Depending on the size and location of particles, the alloys of this system can exhibit superparamagnetic, ferromagnetic and antiferromagnetic ordering.
In this work, the effect of interaction and distribution of ferromagnetic nanoparticles in the Cu - Al - Mn-Fe alloy was studied. The samples were prepared as follows: homogenizing annealing at 850°C for 10 hours, quenching in water from 850°C, then isothermal aging at temperatures of 100, 150 and 200°C for 0.5-5 hours. A feature of the structural state of the alloy is the coarse grain size of austenite. By measuring static magnetization and low-field magnetic susceptibility, the nature of interaction of precipitated ferromagnetic particles depending on their volume fraction and size was established. The behavior of magnetic properties after different heat treatment of alloys has a similar character, the difference lies only in volume fraction of ferromagnetic nanoparticles and their sizes. The change in magnetic characteristics of aged alloys is in direct correlation with the temperature and time of isothermal aging.

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