1. High Temperature Strength of Structural Materials in Gas and Liquid Metal Media Department, Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine, Lviv, 79060, Ukraine
2. High Temperature Strength of Structural Materials in Gas and Liquid Metal Media Department, Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine, Lviv 79060, Ukraine (Corresponding author), e-mail: irynapohrelyuk@gmail.com