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The intergranular embrittlement of nickel by hydrogen: The effect of grain boundary segregation

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Abstract

The mechanical behavior of polycrystalline nickel specimens that were deformed in tension and cathodically charged with hydrogen simultaneously was investigated with particular emphasis on the fracture of such electrodes. This procedure leads to definite, if, however, weak serrated yielding and also markedly reduces the elongation at fracture compared to polycrystals unexposed to hydrogen. Moreover, in contrast to hydrogenated nickel monocrystals which neck down to give a chisel-edge fracture typical of ductile metals, hydrogenated polycrystal fractures are brittle and intergranular. The embrittlement of nickel by hydrogen is shown by means of Auger electron spectroscopy to be associated with the segregation of hydrogen recombination poisons to the grain boundaries. In essence, it is suggested that the entry of hydrogen into the nickel specimens occurs preferentially in the proximity of grain boundary intersections with the free surface, due to the presence therein of Sb and Sn which act as hydrogen recombination poisons and stimulate the absorption of hydrogen by the metal. The presence of such impurities in the grain boundaries suggests that a pressure mechanism is not involved in the intergranular cracking.

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Authors and Affiliations

  1. Materials Science Department, Martin Marietta Laboratories, 21227, Baltimore, Md

    R. M. Latanision (Head, Metal-working Group) & H. Opperhauser (Head, Mechanical and Physical Testing)

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  1. R. M. Latanision
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  2. H. Opperhauser
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Latanision, R.M., Opperhauser, H. The intergranular embrittlement of nickel by hydrogen: The effect of grain boundary segregation. Metall Trans 5, 483–492 (1974). https://doi.org/10.1007/BF02644118

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