Abstract
The Zener relaxation in three Fe–Al alloys with 22, 26 and 28 at.% Al has been studied by isothermal measurements of elastic-energy-dissipation as a function of vibrating frequency in the range from 10 −4 to 10 2 Hz. The activation energy of the Zener relaxation has been determined as follows (in kJ/mol): 238 in Fe–22Al of the disordered bcc (A2) structure, 270 in Fe–22Al of the D0 3 + A2, two phase structure, 235 in Fe–26Al of the B2 ordered structure, 286 in Fe–26Al of the D0 3 ordered structure, and 276 in Fe–28Al–3Cr at temperature close to the D0 3 ↔ B2 transition.
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