Abstract
Slow strain-rate tensile tests have been performed on hydrogen-charged f.c.c. nickel-iron alloys. The hydrogen embrittlement observed in pure nickel is suppressed by alloying with iron so that the deformation and fracture behaviour of alloys containing 50 and 60 % of iron is unaffected by the presence of hydrogen at levels in the order of 3 cm 3/100 g. These and other results indicate that the hydrogen embrittlement of nickel and nickel-iron alloys is associated with the grain boundary precipitation of a hydride which decomposes during or after fracture. As nickel is alloyed with iron the tendency for hydride formation decreases and the hydrogen embrittlement is correspondingly reduced.
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