Fe-Al系合金の低温焼入による磁歪

抄録

The magnetostriction and the magnetization of 10 kinds of polycrystalline ferromagnetic iron-aluminum alloys after various heat treatments were measured. The magnetostriction curve of Fe-Al alloy containing 2.39 per cent of aluminum showed a minimum near saturation when it was heated for one hour at 1200°C, and quenched in water from that temperature. The magnetostriction curve of Fe-Al alloy containing 8.43 per cent of aluminum was quite peculiar and showed irreversible hysteresis, just after heating for one hour at 300°C, then quenching in liquid nitrogen from that temperature. A maximum of saturation magnetostriction appeared at the composition of about 12 per cent of aluminum, and this tendency did not change by heat treatments. Furthermore ,the deviation of saturation magnetization with each heat treatment was largest at the above composition because of order-disorder transformation. The saturation magnetostrictions of the alloys in the composition range, except ordered phase, quenched in water from 1200°C, were larger than that in the state cooled in furnace from the same temperature.