1. G.V. Karpenko Physico-Mechanics Institute of the NAS of Ukraine, Department of Material Science Bases of Surface Engineering, 5, Naukova Str., 79060 Lviv, Ukraine
2. G.V. Kurdyumov Institute for Metal Physics of the NAS of Ukraine, Department of Physics of Strength and Ductility of Inhomogeneous Alloys,36 Academician Vernadsky Boulevard, 03142 Kyiv, Ukraine