Magneto-plastic Effect in the Ferromagnetic Crystals
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概要
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Abstract In a plastic region, it is shown that the flow stress and the stress relaxation of ferromagnetic metals such as Ni, Co and Ni-Co alloy are affected significantly by applying an alternating magnetic field. This ”magneto-plastic effect” can be interpreted in terms of a concept that oscillating magnetic domain walls give a force on the dislocations. The magnitude of the shear stress drop △τ caused by this effect depends upon the plastic strain, strain rate, magnetostriction constants, temparature, total volume swept out by the oscillating domain walls, strength and frequency of the a.c. field. The activation volume of the glide dislocation is reduced to about one half of its original values by this effect. A model on the basis of a thermally activated process is proposed and a thoery induced from this model compares quantitatively with the various experimental results. Further, direct evidencbs for this effect are shown including other investigator's works. From the experimental results obtained through this effect, a role of the short range stress to the flow stress is discussed in some details.
- 山形大学の論文
- 2001-02-15