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Dislocation Motion in Metals Investigated by Means of Pulsed Nuclear Magnetic Resonance

Published online by Cambridge University Press:  15 February 2011

H. Tamler ,
H. J. HackelÖer ,
O. Kanert ,
W. H. M. Alsem ,
J. Th.  and
M. de Hosson
H. Tamler
Affiliation:
Institute of Physics, University of Dortmund, 46 Dortmund–50, W. Germany
H. J. HackelÖer
Affiliation:
Institute of Physics, University of Dortmund, 46 Dortmund–50, W. Germany
O. Kanert
Affiliation:
Institute of Physics, University of Dortmund, 46 Dortmund–50, W. Germany
W. H. M. Alsem
Affiliation:
Dept. of Applied Physics, Materials Science Centre, University of Groningen, Nijenborgh 18, 9747 AG Groningen, The Netherlands
J. Th.
Affiliation:
Dept. of Applied Physics, Materials Science Centre, University of Groningen, Nijenborgh 18, 9747 AG Groningen, The Netherlands
M. de Hosson
Affiliation:
Dept. of Applied Physics, Materials Science Centre, University of Groningen, Nijenborgh 18, 9747 AG Groningen, The Netherlands
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Abstract

We report the first use of nuclear magnetic resonance to investigate dislocation motion in metals. The spin-lattice relaxation rate in the rotating frame T 1ρ−1, of 27Al in polycrystalline, ultrapure Aluminium foils has been measured as a function of plastic-deformation rate έ for two different temperatures (77K and 300K). For έ = 0, the relaxation rate is determined by conduction electrons. For a finite deformation rate έ, an additional contribution to the relaxation rate arising from fluctuations in the nuclear quadrupole interaction due to dislocation motion is observed. From the motion-induced part of the relaxation rate the mean jump distance of a mobile dislocation is calculated which is determined by the density of lattice defects acting as obstacles for moving dislocations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 3: Symposium – Nuclear and Electron Resonance Spectroscopies Applied to Materials Science , 1980 , 421
Copyright
Copyright © Materials Research Society 1981

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References

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