Effect of ordering on magnetic properties of 6.5-percent silicon-iron alloy

The effect of ordering on the magnetic properties such as magnetostriction, magnetic anisotropy, permeability, and coercive force of 6.5-percent silicon-iron alloy has been studied. The alloys were heat-treated at various temperature, and then quenched into oil. It was found that magnetostriction decreases with the growth of DO
3
structure and magnetic anisotropy decreases with the growth of B
2
structure. By oil-quenching from 500°C, permeability became a maximum and coercive force became a minimum. The effect is caused by the growth of DO
3
structure. The improvement of the magnetic properties of 6.5-percent silicon-iron alloy was attained by controlling the ordering in this alloy through the double heat treatment. The values obtained were maximum permeability μm = 52 000, initial permeability
\mu_{i} = 4000
, and coercive force H
c
= 0.088 Oe measured at the maximum induction of 10 kG.