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Journal of Alloys and Compounds 499, 2 (2010) 176-182
A new type of 0 0 1 junction observed in a (B2) Fe-Al-Ni-B alloy by TEM in situ straining
Anna Fraczkiewicz1, 2, Brigitte Décamps3, David Colas1, 4, Olivier Calonne1, 4, François Louchet5

Single crystal foils of an FeAl alloy containing Ni and B are strained at elevated temperatures in an in situ dedicated transmission electron microscope (TEM). The observed characteristic "fork-shaped" dislocation configurations are shown to be a kind of "0 0 1 junction". This junction comes from a reaction between two 1 1 1 superdislocations gliding on different {1 1 2} planes; it results in the presence of a long and sessile edge 0 0 1 dislocation along the intersection of the glide planes. Several hypothetical core structures of such a junction are proposed and their possible effects on macroscopic mechanical properties of the alloy are discussed.
1 :  PECM-ENSMSE - Plasticité, Endommagement et Corrosion des Matériaux
2 :  RMT-ENSMSE - Département Rhéologie, Microstructure, Thermomécanique
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
4 :  R3M - Département Rhéologie, Mécanismes, Microstructures et Matériaux Modèles
5 :  LGGE - Laboratoire de glaciologie et géophysique de l'environnement
Sciences de l'ingénieur/Matériaux
Intermetallics – Mechanical properties – Dislocations – TEM – FeAl