Nanocomposites and nanomaterials

Effect of magnetic field and hydrostatic pressure on nanoparticles formation in Cu-Al-Mn alloys under ageing
A. Titenko1, L. Demchenko2, A. Perekos3, O. Gerasimov3, T.-Z. Ren4
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 Hebei University of Technology, School of Chemical Engineering, Guangrong Road 8, Hongqiao district, China

The creation of nanostructured state plays an important role in improving the physical and mechanical properties of shape memory alloys. The ageing of Cu-Mn-Al alloys, undergoing thermo-induced martensitic transformation (MT), results in the formation of a system of nanosized ferromagnetic particles of Cu2MnAl phase in paramagnetic Cu3Al-matrix. Thermal treatment allows to control the amount and size of particles, which are coherently connected with matrix and do not undergo spontaneous MT at cooling, what affects the temperatures and hysteresis of martensitic transformation [1,2] and defines shape memory effect and superelasticity of this alloys.
For obtaining the optimal complex of magnetic and mechanical properties of Cu-Mn-Al alloys, the thermal treatment in the magnetic field or under hydrostatic pressure was proposed. The results of the work are explained from the position of the phenomenological theory of diffusion decay of solid solution accompanied nanoparticles precipitation. The oriented growth of the precipitated particles in a direction of the applied magnetic field and the increase of their volume fraction under thermal magnetic treatment favours a reversibility of induced martensitic transformation.

1.	Titenko A., Demchenko L. Effect of annealing in magnetic field on ferromagnetic nanoparticle formation in Cu-Al-Mn alloy with induced martensite transformation // Nanoscale Res Lets. – 2016. - 11: 237
2.	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: 285