Mechanical spectroscopy studies of hydrogen mobility in titanium doped iron alloy

Abstract

Mobility of hydrogen atoms in the β-phase of titanium alloys doped with iron is studied by means of mechanical spectroscopy. As shown, the hydrogen dissolution in the β-phase results in appearance of the Snoek-like relaxation at temperatures about 80 K. The ab initio atomic calculations are used to analyse atomic complexes responsible for the relaxation. The results suggest an affinity of hydrogen atom to iron in titanium and a responsible of s-H complexes (s'substitutional atom) with the symmetry lower than the cubic one for Snoek-like relaxation. The obtained activation energy of hydrogen migration in the β-phase assumes that such phase could serve as a pathway of hydrogen to the α-phase where the hydride could form.