Abstract
The diffusion coefficient of hydrogen in aluminium has been determined in the temperature range between 446 and 681 K by a glow discharge permeation method which enables us to extend the temperature range of measurements by enhancement of the permeation flux in spite of the small equilibrium solubility of hydrogen in solid aluminium. The temperature dependence of the diffusion coefficient of hydrogen in aluminium shows a linear Arrhenius relationship with the pre-exponential factor (6.1 ± 0.5) × 10 −5 m 2 s −1 and with the activation energy (54.8 ± 0.4) kJmol −1. These values are higher than those estimated by several previous authors with hydrogen evolution techniques in high temperature regions. However, the present values are well consistent with the results by Ishikawa and McLellan using an electrolytic permeation method around room temperature, suggesting that hydrogen atoms in aluminium diffuse by the interstitial mechanism in the whole temperature range.
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