Abstract
Slip line observations were used to compare the slip character of hydrogen-charged and uncharged nickel. Surface and ‘interior’ slip lines were examined in two-stage carbon replicas taken from nickel compression specimens tested at room temperature. The ‘interior’ slip lines were obtained using a prestrain/polish/re-strain method designed to minimize free surface effects. Hydrogen caused the waviness of slip to increase more rapidly with strain in the range of 2.5% to 10% strain. Thin foil observations showed no differences in dislocation arrangement between hydrogen charged and uncharged specimens at any strain. It was concluded that within the accuracy of these measurements, hydrogen does not increase interior slip planarity in nickel and may in fact increase waviness through slip line broadening. Surface slip, on the other hand, does appear more planar in the presence of hydrogen.
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