Abstract
The electrochemical permeation technique was used to study the effects of deformation on the steady state flux of hydrogen in polycrystalline nickel 270. The hydrogen flux change was found to depend strongly on strain rate. At fast strain rates, the hydrogen flux decreased due to dynamic trapping by newly created dislocations. At slow strain rates, new traps were created more slowly with time and the lattice had a chance to be refilled with hydrogen from the charging surface. Lattice refilling masks the trapping effect so that less of a decrease in hydrogen flux was observed. Under the conditions of total lattice refilling, a decrease in specimen thickness and an increase in input concentration resulted in an increase in the permeation flux. No evidence of dislocation transport was observed in polycrystalline nickel.
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