Abstract
Grain boundary relaxation in a Fe-based ODS alloy is studied byinternal friction measurements. It is found that a grain-boundary peakappears at a lower temperature in the quenched specimens than that inthe annealed specimens. The activation energy of the peak isH = 2.82±0.11 eV for the former while H = 2.53±0.08 eV for thelatter. In addition, a new relaxation peak is observed at the hightemperature side of the grain boundary peak in the quenched specimenswith an activation energy of 4.41±0.25 eV. The height of the peakincreases with increasing quenching temperature. The results suggestthat both the shift of the grain-boundary peak and the appearance ofthe new peak are due to increasing vacancies by quenching that arefavourable for the motion of the grain boundaries.
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