Diffusivity of hydrogen in B2 iron aluminides

The effect of the structure formed during a directional and volume solidification on the hydrogen diffusion coefficient in B2 FeAl alloys was investigated. Hydrogen diffusivity falls off with increasing aluminium content and the long-range order parameter. At the given content of aluminium in the B2 FeAl alloy, the hydrogen diffusivity does not depend on the grain size.