V. G. Gavriljuk is professor of solid state physics and principal scientific researcher at G.V. Kurdyumov Institute for Metal Physics (IMP), Kiev Ukraine. His current research interests include electron structure, short range atomic order and crystal lattice defects in metallic solid solutions. He is the author of about 400 articles and 6 books and supervisor of 18 PhD postgraduates. V. M. Shyvaniuk, Doctor habilitatus (2015), is the head of department for physics of engineering materials at IMP. Education: Kiev National University (1996) and PhD at IMP (2002). Scholarship from the French Government (1998-2001). Prize of Ukrainian President for young scientists (2005) and a postdoctoral fellowship at University of Sciences and Technologies in Lille, France (2005-2006). He specializes in hydrogen-induced relaxation phenomena and phase transformations using mechanical spectroscopy and X-ray diffraction. S. M. Teus, Doctor habilitatus (2018), is scientific researcher at department for physics of engineering materials, IMP, and assistant-professor at Kiev Academic University. Education: Kiev Technical University (2003), master degree (2005) and PhD (2007) at the Kiev branch of Moscow Institute of Physical Engineering. Prize of Ukrainian Parliament (2009), Alexander von Humboldt Foundation research fellowship for postdoctoral researches, Germany (2009-2011), French Embassy Scholarship (2012). Specializes in ab initio calculations of electron structure, mechanical spectroscopy, and mechanical tests.