Internal friction of very high purity lead (99.9999%) at medium temperatures
DOI:
https://doi.org/10.3989/revmetalm.2001.v37.i2.469Keywords:
Internal friction, High purity lead, Dislocation, Microscopy.Abstract
Internal friction spectra of high purity lead (99.9999%) at medium temperatures exhibit a main relaxation peak at 230 K (P1) which depends strongly on the dislocation arrangement. The mechanism associated to P1 relaxation has an activation area between 500b2 and 2000b2 and its activation energy is 0.65±0.05 eV (63±5 KJ/mol), which is only 0,6 times the autodiffusion energy of lead. The behaviour of P1 peak and its dependence on thermomechanical treatments has allowed us to conclude that it is associated to the sliding of dislocations controlled by the climbing of jogs by diffusion of vacancies along the dislocation lines. At a slightly higher temperature, another relaxation (P1) turns up in the spectra, which can be associated to different mechanisms.
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