Nanocomposites and nanomaterials

Magnetic and structural features of aged Cu-Al-Mn-Fe alloys
Demchenko L.1,2, Titenko A.3, Bykanov T.1, Titenko O.1, Babanli M.4, Troshchenkov Yu.3, Huseynov S.4
1 National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", 37, Peremohy Ave., Kyiv 03056, Ukraine.
2 Department of Materials and Environmental Chemistry, Stockholm University, Stockholm SE 106 91, Sweden
E-mail: lesyademch@gmail.com
3 Institute of Magnetism of the NAS and the MES of Ukraine, 36-b, Vernadskoho Blvd., Kyiv 03142, Ukraine.
4 Azerbaijan State University of Oil and Industry, Azadliq Ave., 20, Baku, AZ1010, Azerbaijan

Cu-Al-Mn shape memory alloys (SMA), in addition to their good mechanical and functional properties (plasticity, superelasticity, shape memory effect, high damping capacity), have magnetic properties as well. Alloying with additional elements, as well as heat treatment are used to improve the mechanical properties and shape memory characteristics. Controlling the phase morphology, grain size, volume fractions, sizes, and distribution of precipitates, it is possible to an increase in alloy thermoelasticity associated with a decrease in the width of temperature hysteresis. It has been found that doping with Fe (1%wt.) gives a good improvement in transformation temperature, ductility, and shape memory recovery.
The effect of aging at 100÷200°C for 0.5÷5 hrs on the ferromagnetic nanoparticles precipitation in a quenched Cu-Al-Mn-Fe alloy has been studied. The alloys structural feature is a rather large grain size of 5 mm and a martensitic state at room temperature. Using EPR spectroscopy, static magnetization, and low-field magnetic susceptibility, the interaction of precipitated ferromagnetic particles depending on their volume fraction and size was determined. Some anomalies in EPR spectra and a specific magnetization behavior, associated with the redistribution of magnetic carriers in Cu-Al-Mn-Fe alloy after annealing, which also differs compared to the Cu-Al-Mn alloy [1], were observed.

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