1. Institute of Engineering Materials and Biomaterials, Silesian University of Technology, S. Konarskiego 18A, 44-100 Gliwice, Poland
2. Institute for Ferrous Metallurgy, K. Miarki 12-14, 44-100 Gliwice, Poland
3. Institute of Physics, Faculty of Production Engineering and Materials Technology, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland
4. Faculty of Materials, Metallurgy and Recycling, Technical University of Kosice, Letná 9, 042 00 Košice, Slovak Republic