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Development of Glide Bands During Plastic Deformation of LiF Crystals
Author(s) -
Smirnov B. I.,
Efimov B. A.
Publication year - 1966
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.19660160117
Subject(s) - materials science , lüders band , deformation bands , critical resolved shear stress , dislocation , shear band , limiting , slip (aerodynamics) , crystallography , growth rate , shear (geology) , deformation (meteorology) , shear stress , condensed matter physics , strain rate , mineralogy , composite material , geometry , chemistry , shear rate , thermodynamics , microstructure , physics , mechanical engineering , mathematics , viscosity , engineering
The development of the dislocation structure and shear strain in glide bands of LiF crystals under an applied stress is studied. The following parameters are determined: the rate of lateral band growth ω, the change of shear strain γ in bands during this growth, and the average slip distance of screw dislocations λ during band formation. It is found that the widening of the bands occurs asymmetrically, an increase in the band width resulting in a decrease in ω and in an increase in γ (γ eventually reaches a certain limiting value). On the average, the rate of lateral band growth is about an order of magnitude less than the velocity of the individual dislocations. It is found that λ has a value of 1.5 mm at 20°C which decreases with an increase of the magnesium content of the crystal and also decreases with a decrease of the deformation temperature.