TEM investigation of dislocation dissociation in L12-type Co74Ni3Ti23 single crystals I. The effect of applied stress
- 1 February 1989
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 59 (2) , 423-436
- https://doi.org/10.1080/01418618908205067
Abstract
Transmission electron microscopy in situ weak-beam investigations have been made on superdislocation cores in Co74Ni3Ti23 single crystals deformed at room temperature. Contrast experiments using [220] reflections show that a core transition of superdislocations from superlattice intrinsic stacking fault dissociation into antiphase boundary dissociations occurs under the applied stress. This process is shown to be reversible by applying and removing the external stress. The peculiar temperature and orientation dependence of the critical resolved shear stress observed at low temperatures can be explained on the basis of the core transition process.Keywords
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