The internal friction peaks correlated to the relaxation of Al atoms in Fe–Al alloys

The internal friction peaks correlated to the relaxation of atomic defects in Fe47Al53 alloy

“…The existence of Al Fe will cause quite high strain energy due to atom size misfit [20]. This strained state can be relaxed by means of the migration of Al Fe because they have a low symmetry in the B2 structure and tend to migrate to a lattice site when thermally activated [21,31]. This tendency is consistent with the thermodynamic selection rule for point defect relaxation, i.e.…”

“…the relaxation of point defects occurs provided that their symmetry is lower than that of the lattice [17]. On the other hand, the existence of the vacancies makes it easier for the Al Fe atoms to migrate between the vacancies [31]. It is this relaxation process that results in the appearance of the P1 peak.…”

Low-frequency damping behavior of (Fe83Ga17)97.25Cr2B0.75 sheets

“…With increasing frequency, the damping peak shifts to higher temperature and the peak value also gets higher. This suggests that the peak is a thermally activated relaxation process [11,12]. Overall, the damping behavior of (Fe 83 Ga 17 ) 97.25 Cr 2 B 0.75 sheets is little affected by cooling rate as indicated by Figs.…”

High-temperature relaxation analysis in a fine-grain B2 FeAl intermetallic

“…The value measured by positron lifetime spectroscopy [30][31][32] gives a slightly higher activation energy for selfdiffusion Q SD ¼ 2.7 eV. In our sample the Zener relaxation strength is expected to be small because of the B2 ordering [33], and is masked by the low temperature shoulder of the main peak.…”