抄録
It is shown that the flow stress and the stress relaxation of Ni and Ni–Co alloy single crystals in a plastic region 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 dislocation. The magnitude of the shear stress drop caused by this effect depends upon the plastic strain, total strain rate, magnetostriction constants, total volume swept out by the oscillating domain walls and frequency of the alternating magnetic field. The activation volume of the glide dislocation in thermally activated process is reduced to about one half of its original value by this effect. Further, on the basis of the experimental results obtained through this effect, a role of the short range stress to the flow stress is discussed in some detail.
