Transition from solid-solution softening to hardening in the plasticity of crystalline materials as a manifestation of quasi-localization of dislocation kinks

The mechanical properties of materials are highly sensitive to the content impurities and point defects due their interaction with plastic deformation carriers-dislocations. This opens up possibility some extent control through alloying creating solid solutions. In a number crystalline materials, in addition well-known solid-solution strengthening region low concentration solution atoms, opposite behavior is also observed --- an increase plasticity, or softening. present work, mechanism competition these effects revealed it shown how boundary change can be used estimate microscopic parameters materials. theory predicts trends dependence plasticity on elements, stress, temperature, strain rate, material parameters. Keywords: hardening softening, dislocation kinks, random processes.