Magnetostriction in Hot-Rolled “Alfer” Alloy

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  • 高温圧延されたアルフェル合金の磁歪
  • コウオン アツエン サレタ アルフェル ゴウキン ノ ジワイ
  • Magnetostriction in Hot-Rolled “Alfer” Alloy

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Abstract

The magnetostriction anisotropy of hot-rolled and cast“Alfer” alloy was studied. The saturation magnetostriction is closely dependent upon the roll direction, and shows a minimum value in the direction perpendicular to that of rolling and a maximum value in a direction midway between the roll direction and the direction across it. This magnetostriction vs. roll-direction curve is varied more or less by the heating temperature. The saturation magnetostriction vs. heating temperature curve is complicated, and shows a maximum near 500∼600°C. The saturation magnetostriction shows the largest value in cast state, and, in roll state, decreases with increase of the degree of roll reduction. This tendency is more marked in the direction normal to the rolling. Furthermore, the general theoretical expression was presented for the magnetostriction of rolled b.c.c. magnetic substance, and the saturation magnetostriction in θ direction of grain-oriented polycrystalline sheet, λθ was found to be expressed as follows.<BR>(This article is not displayable. Please see full text pdf.) <BR>Where, \varphi and η are the angle between the principal direction ⟨100⟩ and roll direction in the {100} or {110} planes parallel to roll plane respectively, and h{100}, h{110} and h{A} are the fractions of grain numbers having the principal plane {100}, {110} and the others parallel to roll plane, respectively. {A} means random orientation. K{100}i and K{110}i are the fractions of above planes taking the angle of \varphi or η to the principal direction, respectively. Using the above equation and the magnetostriction constants obtained by Hall, and assuming a reasonable crystal orientation, the theoretical saturation magnetostriction was calculated. A good agreement existed between the theoretical and the experimental results.

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