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NAOSITE : Nagasaki University's Academic Output SITE > 060 工学部・工学研究科 > 060 紀要 > 長崎大学工学部研究報告 > 第13号 >

THE DIFFUSION AND TRAPPING OF HYDROGEN IN COLD WORKED NICKEL


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タイトル: THE DIFFUSION AND TRAPPING OF HYDROGEN IN COLD WORKED NICKEL
著者: Sakamoto, Yoshiichi / Miura, Akira
発行日: 1979年 7月
出版者: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
引用: 長崎大学工学部研究報告, (13), pp.109-116; 1979
抄録: 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.
URI: http://hdl.handle.net/10069/23958
ISSN: 02860902
資料タイプ: Departmental Bulletin Paper
原稿種類: publisher
出現コレクション:第13号

引用URI : http://hdl.handle.net/10069/23958

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