冷間圧延したVicalloy磁石の合金組成に対する磁気異方性の依存性

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  • Dependence of the Magnetic Anisotropy on the Alloy Composition in Cold-Rolled Vicalloy Magnet
  • レイカン アツエン シタ Vicalloy ジシャク ノ ゴウキン ソセイ ニ タイスル ジキ イホウセイ ノ イソンセイ

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Specimens of the permanent magnet alloy “Vicalloy” composed of 2∼6%Cr, 6∼10%V, 52%Co, balance Fe were subjected to reducing 93% by cold rolling and to subsequent tempering at temperatures varying between 20 and 800°C. The measured magnetic properties were saturation magnetization, residual induction, coercive force and magnetic torque. Severe cold-rolling produces the uniaxial roll magnetic anisotropy, in which the easy magnetic direction is perpendicular to the rolling direction. In cold-rolled state, the lower the (Cr+V) content of Vicalloy, the roll magnetic anisotropy is the larger. After tempering cold-rolled Vicalloy at 350∼400°C, the residual induction and the coercive force in rolling direction take the same values as in cross direction, and roll-magnetic anisotropy disappears. By tempering at 500∼600°C, the easy magnetization direction becomes parallel to the rolling direction and the maximum value of coercive force is obtained. As the (Cr+V) content increases, the coercive force increases, but the saturation magnetization decreases. The permanent magnet characteristics of Vicalloy may be explained by an uniaxial magnetic anisotropy which may be caused by either the shape anisotropy or the strain anisotropy of the specimen.

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