A damping peak in quenched cobalt is found to have an activation energy of 0.75 eV. This might be associated with anelastic movement of dislocations and divacancies. Measurement of isothermal decay of damping after quenching gives an activation energy for vacancy formation in the f.c.c. phase of 1.25 eV. The activation energies for internal losses are found to be 0.07 and 0.5 eV for the low and high temperature phases, respectively.
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Kamel et al. (1965) studied this question.
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