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Dislocation Dynamics In B.C.C. Metals: A Nuclear Magnetic Resonance and Transmission Electron Microscopic Study

Published online by Cambridge University Press:  26 February 2011

J. Th. M. De Hosson  and
O. Kanert
J. Th. M. De Hosson
Affiliation:
Department of Applied Physics, University of Groningen, Materials Science Centre,Nijenborgh 18, 9747 AG Groningen, The Netherlands
O. Kanert
Affiliation:
Department of Physics, University of Dortmund, 46 Dortmund 50, FRG
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Abstract

Pulsed nuclear magnetic resonance proved to be a complementary new technique for the study of moving dislocations in b.c.c. metals. From the motion induced part of the spin-lattice relaxation rate the mean jump distance of mobile dislocationshas been measured in Vanadium as a function of temperature. The NMR experiments are combined with transmission electron microscopic investigations to reveal the static structure of defects in the samples. The NMR experiments show that the mean jump distance is nearly constant below 230 K whereas it decreases substantially above 230 K to 300 K indicating a transition that marks two different mechanisms. NMR observations in combination with TEM support the physical picture that above that transition temperature dislocation segments are stopped between localized obstacles whereas below Tc the latticefriction controls the plastic behaviour.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 209: Symposium K – Defects in Materials , 1990 , 311
Copyright
Copyright © Materials Research Society 1991

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