The damping capacity of a Fee5.4Ale0.05Ti (wt.%) alloy in structural states was measured using forced
bending subresonance vibrations and analysed with an emphasis on grain size and cooling rate effects.
Annealing of a cold rolled sheet at higher temperatures or longer times enhances the damping capacity,
which mainly corresponds to pinning effects of grain boundaries against domain wall motion. The
damping capacity of a single crystalline FeeAl sample is nearly five times larger than that of a polycrystalline
sample reflecting a strong negative role of grain boundaries on the damping capacity. Air
cooling of the sample leads to higher damping as compared to water quenching and furnace cooling due
to lower local internal stresses in the former case and preventing of ordering in the latter case. Magnetic
domains are more regular and finer in the air cooled sample. Local internal stresses imposed on the
samples during water quenching, mechanical cleaning of the sample surface, and a static stress lessen
the damping capacity due to a pinning effect of magnetic domain wall displacements. The results
indicate that heat treatment of the rolled sheet has a significant effect on the damping capacity of
specimens.