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Quantum effects in low temperature plastic deformation
Author(s) -
Labusch R.
Publication year - 1984
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170190305
Subject(s) - dislocation , observable , obstacle , quantum , thermal , condensed matter physics , deformation (meteorology) , physics , line (geometry) , materials science , mechanics , quantum mechanics , thermodynamics , geometry , mathematics , composite material , political science , law
A quantum mechanical calculation of the transition rate of a dislocation segment across an obstacle of finite width is performed. Compared with previous theories the achievement of the new treatment is that the finite compliance of the force distance profile is taken into account in the evaluation of the oscillatory modes. As a consequence, not only the D EBYE temperature of the dislocation line but also the obstacle compliance enters the transition rate and determines the temperature regime in which quantum effects become observable. Furthermore, the results of classical thermal activation theory that is valid at high temperatures are for the first time derived from first principles.