Influence of Jog Concentration on the Conservative Motion of Dislocations in Copper

TLDR: In this article, the critical resolved shear stress necessary to move circular prismatic edge-dislocation loops along their glide cylinders was compared to the range of stresses within which various segments of the three-dimensional network began to move.

Abstract: In an annealed crystal of low dislocation density, the critical resolved shear stress necessary to move circular prismatic edge‐dislocation loops along their glide cylinders was compared to the range of stresses within which various segments of the three‐dimensional network began to move. Etch‐pit observations showed that the first segments of the network moved at 2 g/mm2 but that only 60% had moved when the maximum resolved shear stress had reached 38 g/mm2.Circular prismatic loops, which because of their shape have a high jog concentration, were found to move at a critical resolved shear stress greater than 50 g/mm2. It was suggested that jog concentration should be expected to vary from one segment to another of the three‐dimensional network in an annealed crystal, and that this is probably one important reason for the widely different stresses at which individual segments begin to move.

Full text

Lawrence Berkeley National Laboratory
Recent Work
Title
INFLUENCE OF JOG CONCENTRATION ON THE CONSERVATIVE MOTION OF DISLOCATIONS
IN COPPER
Permalink
https://escholarship.org/uc/item/7kx7v9jp
Authors
Petroff, Pierre
Washburn, Jack.
Publication Date
1966-05-01
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Jourm*1 of Applied Physics
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UCRI-
1.6859
Preprint
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UIflVERSITY OF CALIFORNIA
Lawrence Radiation Laboratory
Berkeley, California
ARC Contract No. W-71405.-eng-48

INFLUENCE OF JOG CONCENTRATION ON THE CONSERVATIVE
MOTION OF DISLOCATIONS IN COPPER
Pierre Petroff and Jack Washburn
• Inorganic Materials Research Division, Lawrence Radiation Laboratory,
and Department of Mineral Technology, College of Engineering,
University of California, Berkeley, California
May1966
ABSTRACT
In an annealed crystal of low dislocation density the critical
resolved shear stress necessary t'o move circular prismatic edge dislocation
loops along their glide cylinders was ccnpared to the range of stresses
within which various segments of the three dimensional network began to move.
Etch-pit observations showed that the first segments ofthe network moved
at 2g/mm
2
but that only 60% had moved when the maximum resolved shear
stress had reached 38g/mm 2
Circular prismatic loops, which because of their shape have a
high log concentration, were found to move at a critical resolved shear
stress greater than
509/rxmi
2
.
It was suggested that jog concentration
should be expected to vary from one segment to another of the three
dimensional network in an annealed crystal and that this is probabiy
one important reason for the widely differenttresses at which individual
segments begin to move.
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