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An experimental study of the mobility of edge dislocations in pure copper single crystals

Jassby, K. M. and Vreeland, T., Jr. (1970) An experimental study of the mobility of edge dislocations in pure copper single crystals. Philosophical Magazine, 21 (174). pp. 1147-1168. ISSN 1478-6435.

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The velocity of edge dislocations in 99.999% pure copper crystals has been measured as a function of stress at temperatures from 66°K to 373°K by means of a torsion technique. The range of resolved shear stress was 0 to 15 megadynes/cm^2 for seven temperatures (66°K, 74°K, 83°K, 123°K, 173°K, 296°K, 373°K). Dislocation mobility is characterized by two distinct features: (a) relatively high velocity at low stress (maximum velocities of about 9000 cm/see were realized at low temperatures), and (b) increasing velocity with decreasing temperature at constant stress. The relation between dislocation velocity and resolved shear stress is: v=v_0(τ_r)/τ_0)^n, where v is the dislocation velocity at resolved shear stress τ_r, v_o is a constant velocity chosen equal to 2000 cm/sec, τ_0 is the resolved shear stress required to maintain velocity v_0, and n is the mobility coefficient. The experimental results indicate that τ_0 decreases from 16.3 × 10^6 to 3.3 × 10^6 dynes/cm^2 and n increases from about 0.9 to 1.1 as the temperature is lowered from 296°K to 66°K. The experimental dislocation behaviour is qualitatively consistent with an interpretation on the basis of phonon drag.

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Additional Information:© 1970 Taylor & Francis. Received 30 August 1969 and in final form 12 February 1970. This work was supported by the United States Atomic Energy Commission. K. M. Jassby gratefully acknowledges fellowship support from the National Research Council of Canada throughout the course of this work. CALT-767-P3-8.
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Atomic Energy CommissionUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
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Issue or Number:174
Record Number:CaltechAUTHORS:20150127-103925435
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54137
Deposited By: Tony Diaz
Deposited On:28 Jan 2015 06:51
Last Modified:03 Oct 2019 07:55

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