Dislocation avalanches are like earthquakes on the micron scale

Péter Dusán Ispánovity (), Dávid Ugi (), Gábor Péterffy, Michal Knapek, Szilvia Kalácska, Dániel Tüzes, Zoltán Dankházi, Kristián Máthis, František Chmelík and István Groma
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Péter Dusán Ispánovity: Department of Materials Physics
Dávid Ugi: Department of Materials Physics
Gábor Péterffy: Department of Materials Physics
Michal Knapek: Faculty of Mathematics and Physics, Department of Physics of Materials
Szilvia Kalácska: Department of Materials Physics
Dániel Tüzes: Department of Materials Physics
Zoltán Dankházi: Department of Materials Physics
Kristián Máthis: Faculty of Mathematics and Physics, Department of Physics of Materials
František Chmelík: Faculty of Mathematics and Physics, Department of Physics of Materials
István Groma: Department of Materials Physics

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Compression experiments on micron-scale specimens and acoustic emission (AE) measurements on bulk samples revealed that the dislocation motion resembles a stick-slip process – a series of unpredictable local strain bursts with a scale-free size distribution. Here we present a unique experimental set-up, which detects weak AE waves of dislocation slip during the compression of Zn micropillars. Profound correlation is observed between the energies of deformation events and the emitted AE signals that, as we conclude, are induced by the collective dissipative motion of dislocations. The AE data also reveal a two-level structure of plastic events, which otherwise appear as a single stress drop. Hence, our experiments and simulations unravel the missing relationship between the properties of acoustic signals and the corresponding local deformation events. We further show by statistical analyses that despite fundamental differences in deformation mechanism and involved length- and time-scales, dislocation avalanches and earthquakes are essentially alike.

Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29044-7

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DOI: 10.1038/s41467-022-29044-7

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