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Dislocation Velocity in Copper and Zinc

Vreeland, T., Jr. (1968) Dislocation Velocity in Copper and Zinc. In: Dislocation Dynamics. McGraw-Hill , New York, NY, pp. 529-549.

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The stress dependence of dislocation velocity in copper and in the basal and second-order pyramidal slip systems of zinc has been measured. Dislocations were observed by the etch-pit and Berg-Barrett x-ray techniques before and after application of short-duration stress pulses. The velocity of dislocations of mixed edge-screw orientation in copper and of basal edge dislocations in zinc was found to be a linear function of stress at room temperature. This data gives a value of the dislocation damping constant of 7 x 10^(-4) dyne-sec-cm^(-2), in good agreement with the value deduced from internal friction measurement in copper. Evidence of an unusual stress and temperature dependence for the velocity of dislocations in slip bands on the second- order pyramidal slip system of zinc is reported.

Item Type:Book Section
Additional Information:© 1968 McGraw-Hill. The experiments on copper reported here were conducted by my former student W. F. Greenman. The experiments on basal slip in zinc were conducted by my former student D. P. Pope, now a research fellow at the W. M. Keck Laboratory of Engineering Materials. The interesting results on second-order pyramidal slip were obtained by my student Mr. R. C. Blish as part of his thesis research. Stimulating discussions with these students and with Mr. A. P. L. Turner who contributed greatly to our ability to effectively use the Berg-Barrett technique are gratefully acknowledged. The patient counsel of my colleague, Professor D. S. Wood, throughout this work is sincerely appreciated. Mr. G. R. May gave valuable assistance in the growth of crystals and the preparation of test specimens. This work was sponsored by the U. S. Atomic Energy Commission.
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Atomic Energy CommissionUNSPECIFIED
Record Number:CaltechAUTHORS:20150311-130724347
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ID Code:55705
Deposited By: Tony Diaz
Deposited On:11 Mar 2015 21:32
Last Modified:03 Oct 2019 08:07

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