A rate theory analysis of the temperature dependence of dislocation velocity

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Journal titleMaterials Science and Engineering
Pages260264; # of pages: 5
Subjectdislocation; stresses; thermodynamics; temperature; contrainte (mechanique); thermodynamique; temperature
AbstractA previous study showed that when the apparent activation energy is a linear function of the stress the relation between the dislocation velocity, v, and the stress, tau, can be described well for many crystals on the basis of an asymmetrical potential energy barrier, account being taken of the forward and reverse processes. The present investigation was carried out to determine whether the temperature dependence of dislocation velocity could be described on the same basis, assuming that the activation parameters are independent of the temperature. It is shown that with these simple conditions the rate theory is in good agreement with the experimental results obtained on the stress and temperature dependence of the dislocation velocity for Ge, Si, and CaF[2]. A relationship was also derived from the absolute rate theory for the description of the stress sensitivity, delta lnv/delta ln tau. The expression explains fully the experimental results obtained in Al, Cu and Ag in terms of physical quantities over the whole temperature range. It is concluded that the asymmetrical, triangular energy barrier shape is a useful approximation for the analysis of the thermally activated movement of dislocations.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number12626
NPARC number20374692
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Record identifier8962d843-2992-4fbd-9950-3c5da862707a
Record created2012-07-23
Record modified2016-05-09
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