Hydrogen Transport in Nickel
Fusion Science and Technology / Volume 28 / Number 3P2 / October 1995 / Pages 1169-1174
Tritium Properties and Interaction with Material / Proceedings of the Fifth Topical Meeting on Tritium Technology In Fission, Fusion, and Isotopic Applications Belgirate, Italy May 28-June 3, 1995 / dx.doi.org/10.13182/FST95-A30566
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Hydrogen transport studies were confined to molecular hydrogen driven permeation through two largely different polycrystalline grain structures: (i) microcrystalline nickel with an average grain size of 3µim and (ii) nanocrystalline nickel with an average grain size of 78 nm. Permeation experiments were conducted in a double chamber ultrahigh vacuum system separated by a test specimen. Hydrogen permeabilities and diffusivities through polycrystalline nickel were measured in the temperature range of 30°C to 200°C. At 30°C the nanocrystalline nickel displayed a six-fold increase in permeability with respect to the microcrystalline nickel. The enhancement in permeability is believed to be the result of enhanced intercrystalline volume fraction in the nanocrystalline nickel.
