1Tokyo Keiki Seizosho Co. Ltd., Tokyo
Vicalloy specimens composed of 2∼ 3% Cr, 9∼ 8% V, 52% Co, balance Fe were reduced in thickness from 33% to 93% by cold-rolling and then subjected to tempering at temperatures between 100° and 750°C. The severer is the cold reduction, the higher become the saturation magnetization and uniaxial roll magnetic anisotropy.
The easy direction of uniaxial roll magnetic anisotropy in rolled state is perpendicular to the rolling direction. After tempering at about 400°C, the uniaxial magnetic anisotropy disappers, a slight cubic magnetic anisotropy remaining only. After tempering at about 600°C, the uniaxial magnetic anisotropy appears again, but its easy direction becomes parallel to the rolling direction. When the cold-rolled alloys are tempered at 500°∼ 600°C, the coercive force and mechanical hardness increase, but the saturation induction decreases. In this case, the severer is the degree of cold reduction, the harder is the mechanical hardness, but the lower is the coercive force. An increase of the coercive force is due to the partial transformation of the alpha phase to the gamma phase, during which finely dispersed particles of the gamma phase are formed.
The saturation magnetization and coercive force as a function of the temperature from -70° to +530°C are measured. The saturation magnetization of specimens reduced slightly in thickness increases rapidly below +80°C and the highest value of coercive force is obtained at about +80°C. However, in the case of severe reduction, the curves of the saturation magnetization and of coercive force as a function of the temperature do not reveal the above-mentioned changes.
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