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Stress transients at changes of electron drag during plastic deformation of metals

Wielke, B. (1979) Stress transients at changes of electron drag during plastic deformation of metals. Scripta Metallurgica et Materialia, 13 (2). pp. 157-160. ISSN 0956-716X. doi:10.1016/0036-9748(79)90057-7.

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At low temperatures, the electronic state of a metal may influence its plastic deformation behavior. Many experiments show a pronounced decrease in the flow stress when superconductors enter the superconductive state. More recently stress changes in normal state metals were observed when the applied magnetic field was changed. The theory of Suenaga and Galligan and Granato explains these observations in terms of a dislocation inertial effect. In this theory the damping of dislocations between obstacles is taken to be very small and the mobile dislocations overshoot their static equilibrium position. According to this theory the dynamic interaction of a dislocation and a pinning point leads to a change in the effective instantaneous stress τ*, τ*≈τ(2-BL/2√AC) (1) where B is the viscosity coefficient, C the dislocation line tension, A the effective dislocation mass per unit length, and L the distance between pinning points. We note that only if the assumption, BL << 2√AC is valid, should an effect be observable.

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Additional Information:© 1979 Pergamon Press, Ltd. Received December 26, 1978. The author wishes to thank J. M. Galligan and D. S. Wood for many valuable comments on the manuscript.
Issue or Number:2
Record Number:CaltechAUTHORS:20150211-083301477
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Official Citation:B. Wielke, Stress transients at changes of electron drag during plastic deformation of metals, Scripta Metallurgica, Volume 13, Issue 2, February 1979, Pages 157-160, ISSN 0036-9748, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54692
Deposited By: Tony Diaz
Deposited On:12 Feb 2015 00:46
Last Modified:10 Nov 2021 20:37

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