A gradient Eshelby force on twinning partial dislocations and associated detwinning mechanism in gradient nanotwinned metals
It is well known that the driving force on dislocation glide is the Peach-Koehler force which is proportional to the resolved shear stress on the slip plane. Here, we report a type of configurational force, referred to as the gradient Eshelby force, that can drive the motion of twinning partial disl...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/164040 |
| _version_ | 1826129201741168640 |
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| author | Zhou, Haofei Zhu, Panpan Yang, Wei Gao, Huajian |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Zhou, Haofei Zhu, Panpan Yang, Wei Gao, Huajian |
| author_sort | Zhou, Haofei |
| collection | NTU |
| description | It is well known that the driving force on dislocation glide is the Peach-Koehler force which is proportional to the resolved shear stress on the slip plane. Here, we report a type of configurational force, referred to as the gradient Eshelby force, that can drive the motion of twinning partial dislocations on twin boundaries (TBs) in the absence of any resolved shear stress and cause detwinning in gradient nanotwinned (GNT) metals, an emerging class of multiscale metallic materials with exceptional mechanical properties and novel deformation mechanisms. Specifically, we consider the Eshelby-force-driven motion of twinning partial dislocations and associated detwinning mechanism in GNT metals made of preferentially oriented TBs and columnar grain boundaries (GBs) with spatially varying twin spacing and grain size. Large-scale molecular dynamics simulations validate the proposed Eshelby-driven detwinning mechanism, where twinning partial dislocations are nucleated from GBs and glide on TBs near the region with the steepest local gradient, leading to extensive TB migration and twin annihilation. This study demonstrates the important role of Eshelby force in controlling twinning partial glide and TB migration in GNT metals, which may have broad implications on plastic deformation in gradient nanostructured metals. |
| first_indexed | 2024-10-01T07:36:49Z |
| format | Journal Article |
| id | ntu-10356/164040 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:36:49Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1640402023-01-03T06:13:16Z A gradient Eshelby force on twinning partial dislocations and associated detwinning mechanism in gradient nanotwinned metals Zhou, Haofei Zhu, Panpan Yang, Wei Gao, Huajian School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Gradient Nanotwinned Metals Eshelby Force It is well known that the driving force on dislocation glide is the Peach-Koehler force which is proportional to the resolved shear stress on the slip plane. Here, we report a type of configurational force, referred to as the gradient Eshelby force, that can drive the motion of twinning partial dislocations on twin boundaries (TBs) in the absence of any resolved shear stress and cause detwinning in gradient nanotwinned (GNT) metals, an emerging class of multiscale metallic materials with exceptional mechanical properties and novel deformation mechanisms. Specifically, we consider the Eshelby-force-driven motion of twinning partial dislocations and associated detwinning mechanism in GNT metals made of preferentially oriented TBs and columnar grain boundaries (GBs) with spatially varying twin spacing and grain size. Large-scale molecular dynamics simulations validate the proposed Eshelby-driven detwinning mechanism, where twinning partial dislocations are nucleated from GBs and glide on TBs near the region with the steepest local gradient, leading to extensive TB migration and twin annihilation. This study demonstrates the important role of Eshelby force in controlling twinning partial glide and TB migration in GNT metals, which may have broad implications on plastic deformation in gradient nanostructured metals. This work is supported by the National Natural Science Foundation of China (Grant Nos. 11902289, 12172324) and Zhejiang University through the "Hundred Talents Program". 2023-01-03T06:13:16Z 2023-01-03T06:13:16Z 2022 Journal Article Zhou, H., Zhu, P., Yang, W. & Gao, H. (2022). A gradient Eshelby force on twinning partial dislocations and associated detwinning mechanism in gradient nanotwinned metals. Journal of the Mechanics and Physics of Solids, 159, 104746-. https://dx.doi.org/10.1016/j.jmps.2021.104746 0022-5096 https://hdl.handle.net/10356/164040 10.1016/j.jmps.2021.104746 2-s2.0-85121259211 159 104746 en Journal of the Mechanics and Physics of Solids © 2021 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Gradient Nanotwinned Metals Eshelby Force Zhou, Haofei Zhu, Panpan Yang, Wei Gao, Huajian A gradient Eshelby force on twinning partial dislocations and associated detwinning mechanism in gradient nanotwinned metals |
| title | A gradient Eshelby force on twinning partial dislocations and associated detwinning mechanism in gradient nanotwinned metals |
| title_full | A gradient Eshelby force on twinning partial dislocations and associated detwinning mechanism in gradient nanotwinned metals |
| title_fullStr | A gradient Eshelby force on twinning partial dislocations and associated detwinning mechanism in gradient nanotwinned metals |
| title_full_unstemmed | A gradient Eshelby force on twinning partial dislocations and associated detwinning mechanism in gradient nanotwinned metals |
| title_short | A gradient Eshelby force on twinning partial dislocations and associated detwinning mechanism in gradient nanotwinned metals |
| title_sort | gradient eshelby force on twinning partial dislocations and associated detwinning mechanism in gradient nanotwinned metals |
| topic | Engineering::Mechanical engineering Gradient Nanotwinned Metals Eshelby Force |
| url | https://hdl.handle.net/10356/164040 |
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