1. Department of Materials Science and Engineering, Lviv Polytechnic National University, 12 S. Bandera str., 79000 Lviv, Ukraine
2. Department of Materials Engineering, The John Paul II Catholic University of Lublin, 14 Racławickie Al., 20-950 Lublin, Poland
3. Department of Hydrogen Technologies and Alternative Energy Materials, Karpenko Physico-Mechanical Institute, 5 Naukova str., 79060 Lviv, Ukraine
4. Department of Strength of Materials and Structural Mechanics, Lviv Polytechnic National University, 12 S. Bandera str., 79000 Lviv, Ukraine