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. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.