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Dislocation Substructure in NiAl Single Crystals Deformed at Ambient Temperature

Published online by Cambridge University Press:  15 February 2011

X. Shi ,
T. M. Pollock ,
S. Mahajan  and
V. S. Arunachalam
X. Shi
Affiliation:
Department of Materials Science & Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
T. M. Pollock
Affiliation:
Department of Materials Science & Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
S. Mahajan
Affiliation:
Department of Materials Science & Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
V. S. Arunachalam
Affiliation:
Department of Materials Science & Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
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Abstract

Dislocation substructure in NiAI single crystals oriented for single slip and deformed at ambient temperature has been studied using weak-beam transmission electron microscopy. Deformation is localized in bands that consists mostly of near-edge dislocations, with an interspersion of a high density of elongated prismatic loops. Pure screw dislocations are not observed, but dislocations having “zigzag” configurations that are near-screw in orientation are present. A high density of jogs is observed on both near-edge and zigzag dislocation segments. The mechanisms for the development of this substructure are discussed, emphasizing the role of double cross slip and resulting glissile and sessile jogs of varying heights.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 493
Copyright
Copyright © Materials Research Society 1997

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References

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