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Examination of Dislocation Cores in Ni3Al Using High Resolution Electron Microscopy

Published online by Cambridge University Press:  26 February 2011

Martin A. Crimp  and
P. M. Hazzledine
Martin A. Crimp
Affiliation:
Department of Metallurgy and Science of Materials, University of Oxford, Parks Road, Oxford OXI 3PH, U.K.
P. M. Hazzledine
Affiliation:
Department of Metallurgy and Science of Materials, University of Oxford, Parks Road, Oxford OXI 3PH, U.K.
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Abstract

High resolution electron microscopy has been used to study the core structure of a/2[101] and a/3<112> dislocations in Ni3Al deformed in the range of increasing strength with temperature. a/3<112> coupled SISFs were found to lie on (111) and their structure agreed well with theoretical predictions. a/2[101] superpartials were always dissociated on (111) or (111) planes while the APB plane was found to be (010). Computer simulation of dislocation core structures were found to agree well with the observed dissociations. The APB width was found to increase significantly with increasing deformation temperature near the peak yield strength temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 131
Copyright
Copyright © Materials Research Society 1989

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References

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