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Dislocation Velocity on the {1212}〈1213〉Slip System of Zinc

Blish, R. C., II and Vreeland, T., Jr. (1967) Dislocation Velocity on the {1212}〈1213〉Slip System of Zinc. . (Unpublished) http://resolver.caltech.edu/CaltechAUTHORS:20150304-091549688

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Abstract

Dislocation velocity on the {1212}〈1213〉slip systems of zinc monocrystals was deduced from the rate of growth of slip bands. Near 77°K dislocation velocity is directly proportional to stress, and screw dislocations move more rapidly than edge dislocations. The pre-exponential factor in a thermal activation model is the same for edge and screw dislocations, but the activation energy for edge dislocations (0.22eV) exceeds that for screws by 5%. It is postulated that the larger activation energy for edge dislocations is due to their dissociation in the basal plane. Near room temperature dislocation velocity decreases and cross-glide increases with increasing temperature. It is suggested that dragging dipoles are responsible for the decrease in dislocation velocity. Finally, it is shown that the temperature dependence of both the yield strength and the plastic modulus is similar to the temperature dependence of the stress required to produce a constant dislocation velocity.


Item Type:Report or Paper (Technical Report)
Additional Information:The authors wish to express their appreciation to the U. S. Atomic Energy Commission who sponsored this investigation. The assistance of G. R. May and R. L. Norton in specimen preparation and testing is gratefully acknowledged. Stimulating discussions with Prof. P. B. Hirsch and Prof. F. R. N. Nabarro led to the dissociated dislocation model presented in this paper. CALT-473-26.
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Atomic Energy CommissionUNSPECIFIED
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CALT473-26
Record Number:CaltechAUTHORS:20150304-091549688
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150304-091549688
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55500
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Mar 2015 22:13
Last Modified:04 Mar 2015 22:13

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