The Thermodynamics of Thermally‐Activated Dislocation Glide

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Abstract
A general thermodynamic treatment of thermally‐activated glide is given and the following features discussed: the meaning of force‐distance curves for dislocation‐obstacle interaction, the effect of temperature‐variations of internal stress on the activation enthalpy, temperature‐dependence of flow stress at constant strain‐rate and its relation with the stress‐dependence of activation volume; differences in behaviour between rigid obstacles (precipitate particles, “Seeger zones”) and deformable obstacles (forest dislocations). Application of the theory to “forest” hardening, precipitation hardening and irradiation hardening is outlined.