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Minor Hysteresis Loop in Fe Metal and Alloys

2004; Physical Society of Japan; Volume: 73; Issue: 6 Linguagem: Inglês

10.1143/jpsj.73.1567

1347-4073

S. Takahashi, Lefu Zhang,

Metallurgy and Material Forming

The minor hysteresis loops were measured with increasing magnetic field amplitude H a step by step and analyzed in Fe single crystal, polycrystalline metals and A533B steel. We have defined several new magnetic properties in the minor loops: they are pseudo magnetization B a * , pseudo coercive force H c * , pseudo remanence B R * , pseudo hysteresis loss W F * , pseudo remanence work W R * , and three pseudo magnetic susceptibilities χ H * , χ R * and χ a * . H c * is the magnetic field where the magnetization becomes zero in the minor loop. We found three relations of H c * / H a =1/2, B R * / B a * =3/4 and W R * / W F * =1/6 in a limited range of H a and they are independent of H a as well as the kind of samples. Then we can obtain a simple product rule of 8 B R * H c * =3 B a * H a . Domain wall potential is used to explain the magnetic phenomena. The height of crests and the depth of troughs depend on the grain size, precipitates and dislocation density. The relations between pseudo properties, W R * – B R * , W F * – B a * , H c * – B R * , H c * –1/χ H * , 1/χ R * – B R * and 1/χ a * – B a * are analyzed and simple formulas about the potential structure are obtained. We found four constants and six coefficients. The coefficients increase or decrease with the grain size of polycrystalline metals.