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TEM In-Situ Study of Dislocation Motion in B2 NiAl Single Crystals

Published online by Cambridge University Press:  15 February 2011

B. Ghosh  and
M. A. Crimp
B. Ghosh
Affiliation:
Department of Materials Science and Mechanics, College of Engineering, Michigan State University, East Lansing, MI 48824–1226.
M. A. Crimp
Affiliation:
Department of Materials Science and Mechanics, College of Engineering, Michigan State University, East Lansing, MI 48824–1226.
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Abstract

In an effort to understand dislocation mobility in stoichiometric NiAl single crystals, in-situ tensile deformation experiments have been performed in a transmission electron microscope. Commercially pure and high purity single crystals with <001> and <110> orientations have been examined. Two different thermal treatments were adopted in order to effect the mechanical response. Dislocation motion was observed in all samples. Pre-existing dislocations, either isolated or tangled, were not observed to move at any point leading up to sample failure. Cross-slip of the mobile dislocations was observed in some cases. In commercially pure single crystals, dislocations were found to move at a much slower rate and uniform manner in contrast to motion in high purity single crystals which occurs by rapid jumps.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 467
Copyright
Copyright © Materials Research Society 1997

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References

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