On the nature of the magnetoplastic effect in a beryllium condensate

The effect of a weak constant magnetic field on the temperature and amplitude dependences of the effective shear modulus, low-frequency internal friction, and the ratio of velocities of the dislocation motion in a magnetic field and without it in a beryllium condensate has been investigated. It has been shown that the simultaneous action of a constant magnetic field, mechanical stresses, and a variable temperature results in sign reversal of the magnetoplastic effect in beryllium. It has been found that the sign reversal of the magnetoplastic effect is accompanied by the sign reversal of the ratio of velocities of the dislocation motion, as well as by oscillations in the temperature dependence of this ratio. Possible mechanisms of manifestation of the magnetoplastic effect in beryllium have been discussed in terms of the results of the comprehensive analysis of the amplitude dependences of the studied characteristics.