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In-Situ TEM Deformation Studies of Dislocation Generation and Motion in High-Purity MO Single Crystals

Published online by Cambridge University Press:  15 February 2011

M. Jouiad ,
B. W. Lagow ,
I. M. Robertson  and
D. H. Lassila
M. Jouiad
Affiliation:
Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana IL 61801
B. W. Lagow
Affiliation:
Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana IL 61801, b-lagow@uiuc.edu
I. M. Robertson
Affiliation:
Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana IL 61801
D. H. Lassila
Affiliation:
Materials Science and Technology Division, Lawrence Livermore National Laboratory, Livermore CA 94550
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Abstract

The generation and motion of dislocations in high-purity single crystals of Mo have been observed in real time by deforming electron-transparent samples in-situ in a transmission electron microscope. At 300 K and at low levels of stress, a novel dislocation source was observed that generated a long, straight screw dislocation. The source was a dislocation tangle that existed in the annealed material. An edge dislocation emerged from the tangle, trailing behind it the screw dislocation. These screw dislocations were immobile at this stress level. At higher stresses, the same dislocation tangle generated many dislocations, but now by a pole mechanism. The nature of these tangles and the source operation mechanisms will be described.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 578: Symposia A/C – Multiscale Phenomena in Materials - Experiments in Modeling , 1999 , 113
Copyright
Copyright © Materials Research Society 2000

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References

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