On combined quantized and mechanical descriptions of the Chernov-Luders macroband of localized deformation

A. A. Reshetnyak, E. V. Shilko, Yu P. Sharkeev

Результат исследований: Материалы для книги/типы отчетовМатериалы для конференции

Аннотация

We suggest the quantized approach, based on the recently proposed statistical theory of flow stress for the polycrystalline materials under quasi-static plastic deformation, in order to theoretically describe the Chernov-Luders shear macroband of localized deformation, which is manifested in a number of Fe-containing materials with the second phase presence beyond the yield strength point on the stress-strain curve, σ=σ(ϵ). The procedure essentially uses the quasi-particle interpretation for the part of the minimal mechanical energy for given single-mode polycrystalline aggregate to be necessary to create, according to thermal-fluctuation mechanism, the 0D-defect - nanopore as the initial zone of localized deformation under external loading. With help of the quasi-particles description the analytical expressions both for the scalar density of dislocations for given grain sizes, temperature, the most probable sliding system and for the σ=σ(ϵ) dependence itself. A two-level system, which characterizes the mechanism of absorption and emission of such quasi-particles (dislocons) by the crystal lattice of any grain under quasi-static loading permits to effectively describe the physics of the appearance and propagation of the Chernov-Luders shear macroband. The experimentally observed enhancement of the acoustic emission, accompanying the phenomenon, justifies the interpretation of the dislocon as the composite short-lived particle consisting of acoustic phonons. The case of more realistic three-level system within two-phase model for real polycrystalline samples is suggested as well.

Язык оригиналаАнглийский
Название основной публикацииProceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019
РедакторыVictor E. Panin, Sergey G. Psakhie, Vasily M. Fomin
ИздательAmerican Institute of Physics Inc.
ISBN (электронное издание)9780735419124
DOI
СостояниеОпубликовано - 19 ноя 2019
СобытиеInternational Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019 - Tomsk, Российская Федерация
Продолжительность: 1 окт 20195 окт 2019

Серия публикаций

НазваниеAIP Conference Proceedings
Том2167
ISSN (печатное издание)0094-243X
ISSN (электронное издание)1551-7616

Конференция

КонференцияInternational Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019
СтранаРоссийская Федерация
ГородTomsk
Период1.10.195.10.19

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Цитировать

    Reshetnyak, A. A., Shilko, E. V., & Sharkeev, Y. P. (2019). On combined quantized and mechanical descriptions of the Chernov-Luders macroband of localized deformation. В V. E. Panin, S. G. Psakhie, & V. M. Fomin (Ред.), Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019 [020292] (AIP Conference Proceedings; Том 2167). American Institute of Physics Inc.. https://doi.org/10.1063/1.5132159