Abstract

AbstractThe influence of anion (bromine) and cation (cadmium and barium) impurities, as well as testing atmosphere (air, argon, vacuum) on high temperature deformation of CsI crystals is studied. This deformation in CsI has some peculiarities, which are the superplasticity signs and evidencing about instability of a lattice state. All the impurities studied caused the hardening, their effect in superplasticity depends on its solubility in the CsI lattice: the less the solubility, the stronger the effect. With testing in vacuum and argon, when the formation of point defect clusters occurs, enhanced the superplasticity evidence compared to that by testing in air, where clustering is prevented. These facts, as well as a quality resemblance of stress‐strain curves of single‐ and polycrystalline specimens give the basis for the conclusion, that superplasticity is the manifestation of a plastic instability of the crystal, the instability centers may be precipitates and point defect clusters.

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