Fluctuations in crystalline plasticity
Recently acoustic signature of dislocation avalanches in HCP materials was found to be long tailed in size and energy, suggesting critical dynamics. Moreover, the intermittent plastic response was found to be generic for micro- and nano-sized systems independently of their crystallographic symmetry....
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Académie des sciences
2021-03-01
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| Series: | Comptes Rendus. Physique |
| Subjects: | |
| Online Access: | https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.51/ |
| _version_ | 1797651433505423360 |
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| author | Weiss, Jérôme Zhang, Peng Salman, Oğuz Umut Liu, Gang Truskinovsky, Lev |
| author_facet | Weiss, Jérôme Zhang, Peng Salman, Oğuz Umut Liu, Gang Truskinovsky, Lev |
| author_sort | Weiss, Jérôme |
| collection | DOAJ |
| description | Recently acoustic signature of dislocation avalanches in HCP materials was found to be long tailed in size and energy, suggesting critical dynamics. Moreover, the intermittent plastic response was found to be generic for micro- and nano-sized systems independently of their crystallographic symmetry. These rather remarkable discoveries are reviewed in this paper in the perspective of the recent studies performed in our group. We discuss the physical origin and the scaling properties of plastic fluctuations and address the nature of their dependence on crystalline symmetry, system size, and disorder content. A particular emphasis is placed on the formation of dislocation structures, and on our ability to temper plastic fluctuations by alloying. We also discuss the “smaller is wilder” size effect that culminates in a paradoxical crack-free brittle behavior of very small, initially dislocation free crystals. We argue that the implied transition between different rheological behaviors is regulated by the ratio of length scales $R=L/l$, where $L$ is the system size and $l$ is the internal length. We link this size effect with size dependence of strength (“smaller is stronger”) and the size-induced switch between different hardening mechanisms. We show that the task of taming the intermittency of plastic flow at ultra-small scales can be accomplished by generating tailored quenched disorder which allows one to control micro- and nano-forming and opens new perspectives in micro-metallurgy and structural engineering of miniature load-carrying elements. These insights were beyond the reach of conventional theoretical approaches that do not explicitly account for the stochastic nature of collective dislocation dynamics. |
| first_indexed | 2024-03-11T16:15:43Z |
| format | Article |
| id | doaj.art-ed64248a1ce241b8bff241f51dd33385 |
| institution | Directory Open Access Journal |
| issn | 1878-1535 |
| language | English |
| last_indexed | 2024-03-11T16:15:43Z |
| publishDate | 2021-03-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Physique |
| spelling | doaj.art-ed64248a1ce241b8bff241f51dd333852023-10-24T14:21:59ZengAcadémie des sciencesComptes Rendus. Physique1878-15352021-03-0122S316319910.5802/crphys.5110.5802/crphys.51Fluctuations in crystalline plasticityWeiss, Jérôme0Zhang, Peng1Salman, Oğuz Umut2Liu, Gang3Truskinovsky, Lev4ISTerre, CNRS/Université Grenoble-Alpes, 38041 Grenoble, FranceState Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, ChinaCNRS, LSPM UPR3407, Sorbonne Université Paris Nord, 93430, Villetaneuse, FranceState Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, ChinaPMMH, CNRS UMR 7636, ESPCI ParsiTech, 10 Rue Vauquelin, 75005, Paris, FranceRecently acoustic signature of dislocation avalanches in HCP materials was found to be long tailed in size and energy, suggesting critical dynamics. Moreover, the intermittent plastic response was found to be generic for micro- and nano-sized systems independently of their crystallographic symmetry. These rather remarkable discoveries are reviewed in this paper in the perspective of the recent studies performed in our group. We discuss the physical origin and the scaling properties of plastic fluctuations and address the nature of their dependence on crystalline symmetry, system size, and disorder content. A particular emphasis is placed on the formation of dislocation structures, and on our ability to temper plastic fluctuations by alloying. We also discuss the “smaller is wilder” size effect that culminates in a paradoxical crack-free brittle behavior of very small, initially dislocation free crystals. We argue that the implied transition between different rheological behaviors is regulated by the ratio of length scales $R=L/l$, where $L$ is the system size and $l$ is the internal length. We link this size effect with size dependence of strength (“smaller is stronger”) and the size-induced switch between different hardening mechanisms. We show that the task of taming the intermittency of plastic flow at ultra-small scales can be accomplished by generating tailored quenched disorder which allows one to control micro- and nano-forming and opens new perspectives in micro-metallurgy and structural engineering of miniature load-carrying elements. These insights were beyond the reach of conventional theoretical approaches that do not explicitly account for the stochastic nature of collective dislocation dynamics.https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.51/PlasticityDislocationsStatistical physicsAvalanchesCritical phenomena |
| spellingShingle | Weiss, Jérôme Zhang, Peng Salman, Oğuz Umut Liu, Gang Truskinovsky, Lev Fluctuations in crystalline plasticity Comptes Rendus. Physique Plasticity Dislocations Statistical physics Avalanches Critical phenomena |
| title | Fluctuations in crystalline plasticity |
| title_full | Fluctuations in crystalline plasticity |
| title_fullStr | Fluctuations in crystalline plasticity |
| title_full_unstemmed | Fluctuations in crystalline plasticity |
| title_short | Fluctuations in crystalline plasticity |
| title_sort | fluctuations in crystalline plasticity |
| topic | Plasticity Dislocations Statistical physics Avalanches Critical phenomena |
| url | https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.51/ |
| work_keys_str_mv | AT weissjerome fluctuationsincrystallineplasticity AT zhangpeng fluctuationsincrystallineplasticity AT salmanoguzumut fluctuationsincrystallineplasticity AT liugang fluctuationsincrystallineplasticity AT truskinovskylev fluctuationsincrystallineplasticity |