A new type of 0 0 1 junction observed in a (B2) Fe-Al-Ni-B alloy by TEM in situ straining

Anna Fraczkiewicz; Brigitte Décamps; David Colas; Olivier Calonne; François Louchet

HAL : emse-00498558, version 1

DOI : 10.1016/j.jallcom.2010.03.058

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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 Fraczkiewicz^{1, 2}, Brigitte Décamps³, David Colas^{1, 4}, Olivier Calonne^{1, 4}, François Louchet⁵

(11/06/2010)

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

équipe(s) de recherche : EDGE

domaine

Sciences de l'ingénieur/Matériaux

mots-clés : Intermetallics – Mechanical properties – Dislocations – TEM – FeAl


emse-00498558, version 1
http://hal-emse.ccsd.cnrs.fr/emse-00498558
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Contributeur : Anna Fraczkiewicz <>
Soumis le : Mercredi 7 Juillet 2010, 17:59:00
Dernière modification le : Mercredi 29 Août 2012, 12:48:24