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The effect of stress and temperature on the velocity of dislocations in pure iron monocrystals

Turner, A. P. L. and Vreeland, T., Jr. (1970) The effect of stress and temperature on the velocity of dislocations in pure iron monocrystals. Acta Metallurgica, 18 (11). pp. 1225-1235. ISSN 0001-6160.

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The velocity of edge oriented dislocations in pure iron single crystals was determined as a function of stress and temperature. The velocities were determined from measurements of the growth of slip bands which had been subjected to constant amplitude stress pulses of known duration. Slip bands were observed using the Berg-Barrett X-ray technique. Measurements were made for temperatures of 77, 198, 295 and 373°K. Resolved shear stresses covered a range of 10–500 Mdyn/cm^2. Measured velocities ranged from 10^(−2) to 1 cm/sec. A strong temperature dependence of the dislocation velocity was observed. The results can only be correlated with theories of a single thermally activated mechanism if a substantial entropy of activation exists. Alternative explanations of the experimental results in terms of multiple processes and differences in slip band structure are proposed.

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Additional Information:© 1970 Published by Elsevier Ltd. Received August 4, 1969; revised February 24, 1970. This work was supported by the U.S. Atomic Energy Commission. The authors wish to thank D. F. Stein for supplying the crystal which was studied. Appreciation is extended to D. S. Wood for many helpful discussions during the course of this work. A. P. L. Turner wishes to thank the Fannie and John Hertz Foundation for fellowship support during the time this work was done. We also wish to thank U. F. Kocks for his helpful comments on earlier versions of this manuscript.
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Atomic Energy CommissionUNSPECIFIED
Fannie and John Hertz FoundationUNSPECIFIED
Issue or Number:11
Record Number:CaltechAUTHORS:20150311-143212827
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Official Citation:A.P.L Turner, T Vreeland Jr., The effect of stress and temperature on the velocity of dislocations in pure iron monocrystals, Acta Metallurgica, Volume 18, Issue 11, November 1970, Pages 1225-1235, ISSN 0001-6160, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55713
Deposited By: Tony Diaz
Deposited On:11 Mar 2015 22:49
Last Modified:03 Oct 2019 08:07

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