THE DIFFUSION AND TRAPPING OF HYDROGEN IN COLD WORKED NICKEL
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概要
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The hydrogen diffusion and trapping phenomenon in cold worked polycrystalline nickel have been studied in the temperature range of 283 to 333 K by means of an electrochemical permeation technique. The cold working reduces the hydrogen diffusivity and that results in a slight increase in the activation energy for diffusion. While the solubility of hydrogen increases and the mode of absorption changes from the endothermic to exothermic with cold working. The increase in permeability of hydrogen is attributed not to the short-circuit diffusion but to the hydrogen trapping at dislocations and their stress fields, introduced by cold working. There is also slightly enhanced permeability of hydrogen through grain boundaries. The free energy change in the hydrogen trapping reaction was evaluated by assuming that the dislocations and their stress fields around them in cold worked nickels provide the trapping regions for hydrogen atoms. The energy values are comparable to the binding energy of a hydrogen atom with a dislocation in nickel estimated by the Portvin-Le Chatelier effect.
- 長崎大学工学部の論文
長崎大学工学部 | 論文
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