Диффузионные барьеры для водорода в альфа-фазе титана: расчеты из первых принципов

Abstract

The results of the first-principle calculations of diffusion barriers for hydrogen atoms in the [alpha]-phase of titanium are presented. It was found that the minimal diffusion barrier corresponds to the transition from one tetrahedral interstitial to another, which takes place along the hexagonal axis (the value of this barrier is ~ 0,19 eV). However, this transition does not allow the hydrogen atom to move through the entire crystal volume; therefore, the diffusion jumps between tetrahedral and octahedral, and also between octahedral interstitial sites make a significant contribution tothe diffusion process of hydrogen in The results of the first-principle calculations of diffusion barriers for hydrogen atoms in the [alpha]-phase of titanium are presented. It was found that the minimal diffusion barrier corresponds to the transition from one tetrahedral interstitial to another, which takes place along the hexagonal axis (the value of this barrier is ~ 0,19 eV).