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Low‐Temperature Fluctuational Motion of Dislocations in Crystals II. Manifestations Of Dissipative and Quantum Effects in the Low‐Temperature Plasticity
Author(s) -
Osetskii A. I.
Publication year - 1983
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221170220
Subject(s) - dissipative system , condensed matter physics , dissipation , debye model , plasticity , activation energy , atmospheric temperature range , phonon , thermodynamics , viscosity , materials science , dislocation , chemistry , physics
The temperature behaviour of the fluctuation‐dissipative effects is analysed. At sufficiently low temperatures it is controlled by variations in the viscosity coefficients of the phonon and electron gas. Some experimental data are quoted which can be regarded as evidence for the influence of fluctuation‐dissipative effects upon the low temperature plasticity of materials, i.e. change in the activation energy during NS transition, correlation between the activation energy and the phonon gas viscosity, etc. The temperature dependence of such values as the flow stress, activation energy and activation volume, work hardening coefficients, and the relaxation depth of effective stresses are analysed for the range of temperatures where fluctuation‐dissipative effects are essential. The dependences are calculated both, in the framework of the classical approximation and in the fluctuation‐dissipative model, and compared with the data measured with single crystals of lead and zinc at temperatures below the Debye point. As found, many anomalies observed at low temperatures in the temperature behaviour of the plasticity parameters can be satisfactorily explained as manifestations of the impact of dissipation on the velocity of activated dislocation motion through the crystal.