Abstract
Mathematical models of serrated plastic deformation in metals at ultra-low temperatures are developed. In the framework of the dislocation model, the instability of the plastic flow is shown to be caused by the relay mechanism of overcoming barriers (sub-boundaries, grain boundaries, etc.) by dislocation clusters. Regularities of localization of plastic deformation in alloys are described on the base of the model of interaction of dislocations with point defects. Within the scope of the thermodynamic model, it has been analytically and numerically established that in the range of helium temperatures, a change in the deforming stress, temperature, and plastic strain rate acquires an irregular stochastic nature. The obtained results are in good agreement with experimental data and can be used to construct the theory of plastic deformation of structural metals and alloys in the region of extremely low temperatures.
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The research was carried out within the Russian state task for fundamental scientific research for 2019-2022 (the topic No. 0035-2019-0026, the state registration No. 01201458049) and under the financial support of the Russian Foundation for Basic Research (projects No 18-02-00444-a).
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Sarafanov, G.F., Sarafanov, F.G., Pavlov, I.S. (2021). Instability of Plastic Deformation in Metals at Low Temperatures. In: Altenbach, H., Eremeyev, V.A., Igumnov, L.A. (eds) Multiscale Solid Mechanics. Advanced Structured Materials, vol 141. Springer, Cham. https://doi.org/10.1007/978-3-030-54928-2_31
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DOI: https://doi.org/10.1007/978-3-030-54928-2_31
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