Abstract
The recovery process of hydrogen dissolved in excess in nickel is studied by means of the hydrogen-quenching method which is a modified Schultz's method. Two recovery stages of electrical resistance are found. The lower temperature stage is a new one which presumably arises from trapping and/or clustering of hydrogen atoms in the interior of the specimen. The higher temperature stage which is due to escaping of hydrogen out of the specimen is studied precisely by isothermal annealing in a wide temperature range and with various specimen sizes. It is found that all the experimental results fit the generalized curve obtained from the formerly proposed model calculation, which covers various annealing temperatures and specimen sizes. The diffusion coefficient of hydrogen in nickel is thereby determined as D=1.90×10-3exp (-8890/RT)cm2/sec.
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