Thermally Activated Dislocation Motion

This lecture covers the thermally activated motion of dislocations, starting with the Orowan equation and the concept of activation energy. It delves into the calculation of Gibbs free energy, activation volume, and the geometric aspects of dislocation climb. The instructor discusses experimental measurements of thermodynamic parameters, the concentration of jogs, and the climb velocity of dislocations. Special cases like jogs on a screw dislocation and steady-state creep are also explored, providing insights into the mechanisms governing dislocation motion.