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Investigation of structural changes during recovery of crystal defects in plastically deformed Fe50Ni50 alloy by magnetic measurements

A.R.Ali, F.Z.Ghobrial, E.Takla, K.K.Meleka

In the present work, the behavior of structural changes during recovery of crystal defects in plastically deformed Fe50Ni50 alloy by magnetic measurements is investigated. Isochronal annealing experiments in the temperature range from 25 to 900 oC revealed the existence of different annealing stages in the annealing spectrum of plastically deformed Fe50Ni50 alloy. The first stage appeared around 225 oC activated by 1.08 ± 0.015 eV which is explained based on an increase in local order in the alloymatrix. The second stage detected in the temperature range from 550 to 750 oC arises because of the dissociation of defect clusters activated by 1.85 ± 0.013 eV. The third recovery stage appeared above 750 oC activated by 3.03 ± 0.06 eV, and the process is related to be the climb motion of dislocations during the recrystallization process. Changes in initial lattice defect concentration are found to have influence on the observed stages. The kinetics of FeNi3 precipitation observed at high temperature (Ta<800 oC) are observed.