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 DO3structure and magnetic anisotropy decreases with the growth of B2structure. By oil-quenching from 500°C, permeability became a maximum and coercive force became a minimum. The effect is caused by the growth of DO3structure. 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 , and coercive force Hc= 0.088 Oe measured at the maximum induction of 10 kG.