Low-itemperature anomalies in plastic flow of high-purity single crystals of LiF (<i>T</i> = 0.55−4.2 K)
H KaufmannAcademy of Sciences of the German Democratic Republic, Berlin 1S. V. LubenetsPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 2В. Д. НацикPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 2V. V. PustovalovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 2L. S. FomenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 2С. Э. ШумилинPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 2
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Annotatsiya
Temperature dependences of the critical shear stress and the strain-rate sensitivity of the flow stress are obtained for high-purity LiF at very low temperatures. Thermal insensitivity interval (0.55−2 K) for the above parameters is determined and a considerable temperature dependence of plasticity at higher temperatures is detected, which is typical of thermally activated processes. The threshold temperature decreases slightly with increasing rigidity of the crystal and its prestrain. Basic characteristics of athermal deformation make it possible to attribute it to quantum tunneling of dislocations through Peierls barriers.
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