Investigations of the low-temperature plasticity anomalies in Pb-Sn alloys by active deformation and creep techniques

Complex experimental studies of the kinetics of low-temperature plasticity of lead-tin alloys are carried out in the temperature range 4.2−293 K by the methods of creep and active loading. An anomaly in the temperature dependences of plasticity parameters is observed below 30 K. A detailed thermoactive analysis of the experimental data helped in determining the quantitative parameters of thermally activated movement of dislocations through impurity atoms in the interval 30−160 K. The emergence of this anomaly is associated with a change of the thermal activation mechanism to the thermal inertia mechanism below 30 K, and to the quantum-inertial mechanism of dislocation movement through impurity centers below 15 K.

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