Abstract

— The temperature and concentration dependences of critical resolved shear stress (CRSS) for KC1KBr solid solutions were studied from 4.2 K to 293 K. At lower temperatures the solid solutions less than 10 mol % KBr and more than 90 mol % KBr showed solution softening. The solid solutions of the other concentrations were hardened at all the temperatures tested. The dislocation motion in the higher concentration region was impeded only by the solute ions, and in the lower concentration region by the Peierls barriers in addition to the solute ions. CRSS and activation volume were theoretically determined as a function of temperature and concentration in highly concentrated solid solutions. The theoretical and experimental results show a good agreement.

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