Influence of Plastic Deformation on Coercive Field and Initial Susceptibility of Fe-3.25% Si Alloys

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Abstract
Measurements were made of the deformation dependence at room temperature of the coercive field Hc and the initial susceptibility χi and the recovery process was investigated during isothermal annealing. At the same time the dislocation density in the specimens was microscopically determined by metallographic techniques. The results show that the coercive field varies corresponding to the N1/2 proportionality law stated in literature. The initial susceptibility of the material varies approximately as χi=const/N1/2. The relative rate of change in Hc and χi with annealing time for specimens of various degrees of plastic deformation remains constant indicating that a single mechanism of rearrangement and recovery of dislocations determines these magnetic properties. Measurements of mechanical hardness showed that it varies in the same fashion as N1/2. Though indirect experimental evidence of a relation between Hc, χi, and N exists, to our knowledge our investigations are unique as we have made an attempt, with the help of metallographic examination, to relate Hc, χi, and hardness directly with the dislocation density.