Abstract
1. A decrease in critical shear stress at 1.4°K was detected for all three fundamentally oriented copper single crystals. A similar temperature dependence for the elastic limit in copper polycrystals was not detected. 2. The studied hardening curve irregularities were either caused by avalanche, slip effects or twinning, depending on the single crystal strain axis. 3. The calculated activation parameters confirmed that the process controlling the plastic deformation in copper was the thermally activated intersection of gliding dislocations with forest dislocations. 4. An anomalous increase in relaxation depth at 1.4°K in comparison to the values at higher temperatures was detected.
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