Dislocation mobility mechanisms at medium temperatures in very high purity lead (99.9999 %)
Keywords:Internal friction, Dislocation, Pure lead
The internal friction spectrum of high purity lead (99.9999 %) at medium temperatures has been studied. A new peak (P1) has been found at 240 K, which has not been studied up to now. The activation energy of the process associated with F, has been determined and its experimental behaviour has also been systematically studied. The comparison between the results and the theoretical predictions of the models of dislocation mobility allows us to attribute the P1 peak to the sliding of dislocations, controlled by the climbing of jogs induced by the diffusion of vacancies along the dislocation line. This conclusion is analogue to that obtained in previous works for the P1v peak in very high purity aluminium (99.9999 %).
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