Investigation of structural changes during recovery of crystal defects in plastically deformed Fe_(50)Ni_(50) alloy by magnetic measurements

摘要

In the present work, the behavior of structural changes during recovery of crystal defects in plastically deformed Fe_(50)Ni_(50) alloy by magnetic measurements is investigated. Isochronal annealing experiments in the temperature range from 25 to 900 ℃ revealed the existence of different annealing stages in the annealing spectrum of plastically deformed Fe_(50)Ni_(50) alloy. The first stage appeared around 225 ℃ activated by 1.08 ± 0.015 eV which is explained based on an increase in local order in the alloy matrix. The second stage detected in the temperature range from 550 to 750 ℃ arises because of the dissociation of defect clusters activated by 1.85 ± 0.013 eV. The third recovery stage appeared above 750 ℃ 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 FeNi_3 precipitation observed at high temperature (Ta＜800 ℃) are observed.