Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains
The work addresses the effects of nanosize particles and grain refinement on the patterns of stress serrations and kinematics of deformation bands associated with the Portevin–Le Chatelier instability of plastic flow. Ultra-fine-grained microstructure was obtained using equal-channel angular pressin...
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MDPI AG
2017-08-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/7/9/325 |
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| author | Daria Zhemchuzhnikova Mikhail Lebyodkin Tatiana Lebedkina Anna Mogucheva Diana Yuzbekova Rustam Kaibyshev |
| author_facet | Daria Zhemchuzhnikova Mikhail Lebyodkin Tatiana Lebedkina Anna Mogucheva Diana Yuzbekova Rustam Kaibyshev |
| author_sort | Daria Zhemchuzhnikova |
| collection | DOAJ |
| description | The work addresses the effects of nanosize particles and grain refinement on the patterns of stress serrations and kinematics of deformation bands associated with the Portevin–Le Chatelier instability of plastic flow. Ultra-fine-grained microstructure was obtained using equal-channel angular pressing of the initial coarse-grained alloy. Tensile tests were carried out on flat specimens at strain rates in the range from 3 × 10−5 to 1.4 × 10−2 s−1. Using local extensometry techniques, it was found that the presence of nanoscale precipitates promotes quasi-continuous propagation of deformation bands in the entire strain-rate range. The grain refinement leads to a transition to relay-race propagation at high strain rates and static strain localization at low rates. The results are discussed from the viewpoint of competition between various dynamical modes of plastic deformation associated with collective dynamics of dislocations. |
| first_indexed | 2024-12-13T01:04:56Z |
| format | Article |
| id | doaj.art-18b5913522ea43428462d817dda37365 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-13T01:04:56Z |
| publishDate | 2017-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-18b5913522ea43428462d817dda373652022-12-22T00:04:34ZengMDPI AGMetals2075-47012017-08-017932510.3390/met7090325met7090325Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine GrainsDaria Zhemchuzhnikova0Mikhail Lebyodkin1Tatiana Lebedkina2Anna Mogucheva3Diana Yuzbekova4Rustam Kaibyshev5Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), CNRS UMR 7239, Université de Lorraine, 7 rue Félix Savart, BP 15082, 57073 Metz CEDEX 03, FranceLaboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), CNRS UMR 7239, Université de Lorraine, 7 rue Félix Savart, BP 15082, 57073 Metz CEDEX 03, FranceCenter of Excellence “LabEx DAMAS”, Université de Lorraine, 7 rue Félix Savart, 57073 METZ, FranceLaboratory of the Mechanical Properties of Nanoscale Materials and Superalloys, Belgorod State University, Pobedy Street 85, Belgorod 308015, RussiaLaboratory of the Mechanical Properties of Nanoscale Materials and Superalloys, Belgorod State University, Pobedy Street 85, Belgorod 308015, RussiaLaboratory of the Mechanical Properties of Nanoscale Materials and Superalloys, Belgorod State University, Pobedy Street 85, Belgorod 308015, RussiaThe work addresses the effects of nanosize particles and grain refinement on the patterns of stress serrations and kinematics of deformation bands associated with the Portevin–Le Chatelier instability of plastic flow. Ultra-fine-grained microstructure was obtained using equal-channel angular pressing of the initial coarse-grained alloy. Tensile tests were carried out on flat specimens at strain rates in the range from 3 × 10−5 to 1.4 × 10−2 s−1. Using local extensometry techniques, it was found that the presence of nanoscale precipitates promotes quasi-continuous propagation of deformation bands in the entire strain-rate range. The grain refinement leads to a transition to relay-race propagation at high strain rates and static strain localization at low rates. The results are discussed from the viewpoint of competition between various dynamical modes of plastic deformation associated with collective dynamics of dislocations.https://www.mdpi.com/2075-4701/7/9/325aluminum alloysprecipitatessevere plastic deformationmechanical characterizationPortevin–Le Chatelier effectdeformation bandscollective dislocation dynamics |
| spellingShingle | Daria Zhemchuzhnikova Mikhail Lebyodkin Tatiana Lebedkina Anna Mogucheva Diana Yuzbekova Rustam Kaibyshev Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains Metals aluminum alloys precipitates severe plastic deformation mechanical characterization Portevin–Le Chatelier effect deformation bands collective dislocation dynamics |
| title | Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains |
| title_full | Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains |
| title_fullStr | Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains |
| title_full_unstemmed | Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains |
| title_short | Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains |
| title_sort | peculiar spatiotemporal behavior of unstable plastic flow in an almgmnsczr alloy with coarse and ultrafine grains |
| topic | aluminum alloys precipitates severe plastic deformation mechanical characterization Portevin–Le Chatelier effect deformation bands collective dislocation dynamics |
| url | https://www.mdpi.com/2075-4701/7/9/325 |
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