On plastic deformation of Pb0·95Sn0·05Se single crystals

Abstract

Abstract Stress-strain characteristics of Pb0·95Sn0·05Se single crystals grown from the vapour phase have been investigated in the plastic deformation range. Samples were compressed along a (100) direction, with strain rate varying between 1·85 × 10−5 and 1·85 × 10−3 s−1, in the temperature interval 300–573 K. Plastic deformation was found to include all three stages of deformation hardening and to be performed by slip of dislocations on the {110} (110) slip system. In conditions when deformation took place in a single-slip system, internal and effective stress values were determined in the easy-glide region. The stress relaxation method was used, taking into account the hardening in process of relaxation. The effective stress as a function of strain rate was found to obey a power law, while the temperature dependence had a thermally activated character. Values of activation parameters were found as a function of effective stress by thermal activation analysis. The results obtained are interpreted in the paper by a model of dislocation interaction with systems of intrinsic point defects in the lattice.