Abstract
Isochronal and isothermal annealing experiments in the temperature range 25 to 900 °C revealed the existence of different annealing stages in the annealing spectrum of plastically deformed Fe-50% Ni alloy by observing the associated changes in maximum magnetic permeability (μ max ) and magnetic coercivity (H er) . On annealing, a first stage centered around 225 °C appears, activated by (1.16 ± 0.02) eV which is explained on the basis of an increase in local order in the alloy matrix. A second stage in the temperature range 550 to 750 °C arises because of the dissociation of defect clusters, activated by (1.8 ± 0.1) eV. The third recovery stage appears above 750 °C, activated by (3.06 ± 0.02) eV, and the process is related to the climb motion of dislocations during the recrystallization process. Changes in initial lattice defect concentration were found to have influence on the amplitude and the position of the different observed stages. The kinetics of FeNi 3 precipitation observed at high temperatures (T a ≥ 800 °C) are discussed.
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