Abstract
The hydrogen properties of permeability, diffusivity and Sieverts' constant in the GlidCop A125 IG alloy have been experimentally evaluated by using the gas permeation technique. The experimental temperature range used has been from 573 K to 793 K and the high purity hydrogen loading pressures from 10 3 Pa to 1.5 x 10 5 Pa. The resultant diffusive transport parameters are a permeability of Φ (mol m -1 Pa- 1/2 s -1 ) = 5.87 x 10 -7 exp(-80.6 kJ mol -1 /RT), a diffusivity of D (m 2 s -1 ) = 5.70 x 10 -5 exp(-76.8 kJ mol -1 /RT) and a Sieverts' constant of K s (mol m -3 Pa -1/2 ) = 6.01 x 10 -3 exp(-3.7 kJ mol-' /RT). The resultant trapping parameters are a trap density of N t =3.1 x 10 22 m -3 and a trapping energy of E t =75.4 kJ mol -1 . The presence of ultrafine Al 2 O 3 particles in this material has been demonstrated to affect enormously the hydrogen isotope transport behaviour in comparison to the corresponding base material (Cu) and other copper alloys. Hydrogen trapping phenomenon has become more noticeable in the lower temperature range, yielding an exothermic absorption of hydrogen below 688 K and a decrease in the effective hydrogen diffusivity.
Published Version
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