Abstract
Abstract The development of a sound physical view regarding crack quasi-stability during subcritical crack extension still remains challenging. It is evident that further progress requires exploration of the refined micromechanical processes of fracture. The present study emphasizes the experimental findings which indicate a crack arrest potential in terms of flexible dislocation activity available in semibrittle b.c.c. single crystals. This is particularly demonstrated in Fe-3 wt% Si single crystals with subcritical crack extension induced by sustained loading and external hydrogen interaction. Pre-fatigued crystals oriented in (001)[010] and loaded above 18 MPa m½ in 1 atm of gaseous hydrogen resulted in slow crack growth. Since a fine-scale localized approach was adopted, observations were conducted with the use of selected-area channelling patterns in a scanning electron microscope. This provided a 5 μm spatial resolution and a submicrometre depth resolution with regard to strain measurement. The curr...
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