Crystal Plasticity Associated With
Crack Stability In Single Crystals
Author(s)
S. H. Chen, Y. Katz & W. W. Gerberich
Abstract
A sound physical view regarding quasi crack stability behavior in the sub critical
domain remains challenging. As such, it requires exploration and insights into
the micromechanical processes of fracture. This study is centered on Fe-3wt %
Si single crystals with sub critical crack growth induced by the interactive effects
of sustained load and external hydrogen. Pre sharp cracked crystals oriented in
both the (001)<010> and (001)<110> directions have been loaded at specific
stress intensity factors at 1atm gaseous hydrogen environment that affected
dramatically the crack stability. Generally, a fine scale localized approach has
been adopted with attention to the crack tip stress field distribution and the
tracking of the near fracture surface micro plasticity. In addition the evaluation
of the local effective driving force has been attempted. Using an alternative
definition, the study is engaged with damage evolution that can be attributed to
the dynamic behavior of the crack extension in terms of initiation and the arrest
potential. This kind of discontinues behavior still remains in the framework of a
global propagation controlled cleavage process. Experimentally, the study was
also assisted by the Selected Area Channeling Patterns (SACP) technique that
enabled 5µm spatial in a sub micron depth resolution regarding the local strain
measurements.
The current study emphasized the important role of the dislocation dynamic in
semi brittle BCC single crystals. Moreover, it was found that the anisotropic
plasticity dominates the near crack tip behavior with implications on the
deformation features and thus on the dynamic sub critical crack extension
behavior.
Keywords: crack stability, single crystal, crystal plasticity, hydrogen effects, sub
critical domain.
Keywords
crack stability, single crystal, crystal plasticity, hydrogen effects, sub
critical domain.
Related Book
Other papers in this volume
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