Thermodynamics analysis of magnetoplastic effects in «non-magnetic» metals

Morgunov R.B., Piskorsky V.P., Valeev R.A., Korolev D.V.
UDC
669.017
DOI
10.18577/2307-6046-2018-0-12-79-87
Article PDF (Russian) (669.08 KB)
How to cite
Morgunov R.B., Piskorsky V.P., Valeev R.A., Korolev D.V. Thermodynamics analysis of magnetoplastic effects in «non-magnetic» metals // Proceedings of VIAM. 2018. No. 12. DOI: 10.18577/2307-6046-2018-0-12-79-87. URL: https://test.viam.ru/en/journal/2018/12/9
Keywords
magnetoplasticity, thermodynamic analysis, yield strength, hardness, magnetic field, mechanical properties.
Abstract

Many works were devoted to the influence of the magnetic field of 0.05 - 30 T induction and the duration of exposure in the magnetic field from 1 µs to several days on the mechanical properties of polymers, ion crystals, semiconductors, transition metals, fullerites, technological alloys. A brief analysis of the results in the study of magnetoplastic effects (the phenomena of changes in the plasticity and strength of metals under the action of a magnetic field) was done. 

The classification of known and physically justified effects on the basis of thermodynamic analysis of the energy is reported for the systems and the relaxation time of changes induced by the field. Controversial experimental results and their interpretations are discussed. Unified physical mechanisms controlling magnetoplasticity stimulated discussion of magnetoplastic effects simultaneously in nonmetallic solids, where the magnetic field also change structurally sensitive properties.

Most of the magnetoplastic effects, regardless of the type of material, obey a simple rule: transition time decreases with the growth of the magnetic field and the energy transmitted to the crystal lattice. Magnetoplastic effects which, obey this law can be called as "power" effects, i.e. those, which has a value of the magnetic force on the structural elements of the crystal or defects. Another part is characterized by more exotic mechanisms of influence of the field, not limited by the transfer of energy necessary for overcoming potential barriers. It is shown, that the effect of the magnetic field on the subsystem of structural defects is irreversible in many cases, while there are completely irreversible magneto plastic effects. In this case, the system does not return to its original free energy state even if its plastic properties seem to be restored.

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