The behavior of H during the directional solidification of pure Al was studied. On the basis of the H distribution in the resultant solid, it was deduced that the diffusivity at 933K was equal to 7.8 x 10-8m2/s.

Hydrogen in Pure Aluminium Solidified Unidirectionally. M.Imabayashi, M.Ichimura, Y.Kanno: Transactions of the Japan Institute of Metals, 1983, 24[2], 93-100