Effect of hydrogen on dislocation nucleation in alloy 718
Journal article, Peer reviewed
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Original versionInternational journal of hydrogen energy. 2017, 42 (24), 15933-15942. 10.1016/j.ijhydene.2017.04.290
In situ electrochemical nanoindentation has been used to study the effect of hydrogen on the nanomechanical response of Alloy 718. Observations show that hardness increase as a result of hydrogen charging. Also, the hydrogen charging gives a reduced pop-in load and pop-in width. This is related to a reduction in the energy needed for dislocation nucleation and the mobility of the dislocations in the presence of hydrogen. Two grains with different orientations has been tested here. The pop-in load and width obtained in the (101) orientation was more affected by the presence of hydrogen than those achieved in the (111) oriented grain.