Abstract
The plasticity of solid parahydrogen with lowered deuterium contents under stepwise uniaxial extension at liquid helium temperatures 1.8–4.2K is investigated. Work hardening curves for single crystals are measured. The maximum possible values of the elongation of the samples without their fracture at minimum stress values are reached. Features of super-plastic irreversible deformation of samples are observed. Anomalous temperature dependence of deformation parameters is found. The character of this anomaly exhibits evidence of the coherent motion of dislocation kinks in Peierls relief, modified by residual ortho and deuterium impurities.
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