Effect of a constant magnetic field on the yield stress of nickel at 4.2 °K

The effect of the domain structure on the magnitude of the yield stress of 99.8% pure single crystals of nickel is investigated at 4.2°K. The investigation is carried out by means of deformation by extension in longitudinal, transverse, and alternating magnetizing fields which enables us to vary the relative orientation of slip bands and magnetic domain walls. An increase in the yield stress is observed when the extension axis is in the same direction as the magnetization field. A considerably larger hardening effect ( ∼ 20%) is obtained in the loading of crystals in alternating longitudinal and transverse magnetization fields; this can be connected with the fine subdivision of the domain structure during magnetic reversal and its partial pinning during deformation up to the yield stress.

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