Quantum-inertial mechanism of plastic deformation of lead-based alloys at temperatures around and below 1 K

The temperature dependences of the yield stress and sensitivity of the deforming stress to the deformation rate of Pb–Sn and Pb–Sb single crystals are studied in the temperature range 0.5–80 K. The parameters of the thermally activated motion of dislocations through impurity centers are determined. The low-temperature plasticity anomalies observed below 30 K are attributed to the inertial mechanism, while the anomaly observed at T < 10 K can be described satisfactorily by the quantum-inertial mechanism of dislocation movement through local barriers. A method is proposed for a quantitative estimation of the contribution from inertial and quantum properties of dislocations to the observed concentration and temperature dependences of the plasticity parameters.

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