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

Structure and anelasticity of ordered and disordered Fe–Ge alloys

“…It has been explained by C-vacancy [36] or vacancy-vacancy complexes [37], with probably both types of defects contributing [38]. This peak, as well as P3, decreases due to annealing much faster than the Snoek-type (P1þP2) peaks.…”

High-temperature internal friction in a Fe–38at.% Al intermetallic

“…Concerning the P2 peak, the measured temperature, around 900 K for 1 Hz, seems to be too high for the Zener relaxation in comparison with the data reported in the literature (≈780 K at 1 Hz) [5]. Recent studies of internal friction in Fe-Al near the stoichiometric composition [21] seem to indicate that in rich Al intermetallics more complex point defect interactions could take place, such as double or triple defects [22]. In this framework, we suggest that the P2 peak observed in the present work could not correspond to the classically observed Zener peak, but to a higher temperature peak involving complex point defect relaxations.…”

Internal friction peak associated with the ordering process in B2 FeAl alloys

“…The P1 peak is not associated with this ordering process because it has typical relaxational nature, i.e. the peak temperature shifts to high temperatures with increasing frequency [8]. This does not accord with the properties of IF peak arising from phase transformation [9,10].…”

“…However, the P2 peak disappeared during the subsequent cooling measurement. The mechanism of the P1 peak has been well documented to originate from the stress-induced migration of Al antisite atoms (Al Fe ) between Fe vacancies (V Fe ) in our previous work [8], thus it will not be discussed in the present study. For the furnace-cooled specimens, the IF behavior was very close to that for the oil-quenched specimens during cooling measurements.…”