Ni-FeおよびNi-Co系fcc合金の水素脆化

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  • Hydrogen Embrittlement of Ni-Fe and Ni-Co Binary Alloys
  • Ni Fe オヨビ Ni Coケイ fcc ゴウキン ノ スイソ ゼイカ

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To clarify the correlation between the hydrogen embrittlement and the hydride formation, cathodically hydrogen charged Ni-Fe and Ni-Co binary alloys with fcc structure have been investigated by means of X-ray diffraction and tensile test. The results are summarized as follows: (1) The hydrogen embrittlement of these alloys occurred always only when the hydrides were formed. (2) The degree of the embrittlement was dependent on the magnitude of the miscibility gap of the alloy-hydrogen systems and the amount of the hydride formed. (3) The embrittlement was enhanced by the dislocation transport of hydrogen. The enhancement was remarkable, when the amount of the hydride formed was small. (4) Hydrogen charging produced dislocations of high density and grain boundary microcracks in Ni specimens, only when the hydride was formed.<BR>From these results the embrittlement was ascribed to the lattice expansion which accompanied the precipitation of the hydride phase as in the case of Ni-Cu and Pd-Ag alloys.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 49 (10), 839-846, 1985

    公益社団法人 日本金属学会

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