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Investigation of the Mechanism of Influence of Stress Corrosion on the Development of Macroplastic Instabilities of Aluminum–Magnesium Alloy

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Abstract

Macroscopic jumps of plastic deformation (few percent in amplitude) on creep curves of aluminum–magnesium alloy, caused by a local effect of concentrated solution of hydrochloric acid on the alloy surface, have been revealed and investigated using a complex of high-speed methods for studying the dynamics of deformation bands and discontinuous deformation. Results of computer simulation of the formation of fractal morphology of the corrosion front and elastic stress fields under stress-corrosion conditions are presented. It is shown that, in the complex structure of corrosion boundary, containing “peninsulas” and “fjords,” the level of local stress at fjord vertices exceeds the level of applied stress by ~1–1.5 orders of magnitude, which may lead to collective responce of many dislocation sources and development of macroscopic dislocation avalanche, causing a strain jump in the creep curve.

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Funding

The experimental part of the study, supported by the Russian Foundation for Basic Research (RFBR) (grant no. 19-08-00395), was performed on equipment of the Center of Collective Use of Derzhavin Tambov State University, with partial support of the Ministry of Science and Higher Education of the Russian Federation within the project according to agreement no. 075-15-2021-709 (unique project identifier RF—2296.61321X0037). The computer studies were supported by RFBR (grant no. 19-38-90145 “Aspiranty”).

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Authors and Affiliations

  1. Tambov State University, 392000, Tambov, Russia

    A. A. Shibkov, S. S. Kochegarov, A. A. Denisov, A. E. Zolotov, M. F. Gasanov & A. V. Shuklinov

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  1. A. A. Shibkov
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  2. S. S. Kochegarov
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  3. A. A. Denisov
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  4. A. E. Zolotov
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  5. M. F. Gasanov
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  6. A. V. Shuklinov
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Correspondence to A. A. Shibkov.

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Translated by Yu. Sin’kov

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Shibkov, A.A., Kochegarov, S.S., Denisov, A.A. et al. Investigation of the Mechanism of Influence of Stress Corrosion on the Development of Macroplastic Instabilities of Aluminum–Magnesium Alloy. Crystallogr. Rep. 67, 156–165 (2022). https://doi.org/10.1134/S106377452202016X

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  • DOI: https://doi.org/10.1134/S106377452202016X

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