An Estimate of Vacancy Migration Energy from Aging Experiments in an Iron 3.8 at% Molybdenum Alloy(Physics)
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Resistivity change during isochronal aging of a high purity Fe-3.8 at.% Mo alloy is investigated. The resistivity first decreases between 300℃ and 400℃, passing through a minimum it increases to a maximum at 650℃ and decreases again. Molybdenum atoms are considered to form clusters in the first stage of resistivity decrease. The clustering at temperatures below 400℃ is possible only when quenched-in excess vacancies are present and enhance the solute atom diffusion. This observation implies that vacancies in pure iron also migrate at an appreciable rate at around 350℃ with an activation energy of about 1.2 eV.
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