The structure of the plastic zone ahead of a crack has been studied in nickel using thein situ transmission electron microscopy technique. The cracks formed in the thin foils were shear cracks of mode III type. For tensile axis orientations near [1 1 1], the plastic zone was in the form of a thin ribbon consisting of an inverse pile-up of partial dislocations. This structure changed to a broad array of perfect dislocations for the orientations near [0 0 1]. The observation of partial dislocations in nickel may be considered anomalous because of its relatively high stacking fault energy. The orientation dependence of the splitting is discussed in terms of various mechanisms such as impurity, stress-induced separation of partials, and mutual interaction between the partials. It is concluded that the stress-induced nucleation and separation of the partials are responsible for the orientation dependence but other factors such as the mutual interaction of the partials must be considered to explain the observed width of the splitting.
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Kobayashi, S., Ohr, S.M. Dislocation arrangement in the plastic zone of propagating cracks in nickel. J Mater Sci 19, 2273–2277 (1984). https://doi.org/10.1007/BF01058104
- Transmission Electron Microscopy
- Plastic Zone
- Shear Crack
- Stack Fault Energy