Revealing grain boundary kinetics in three-dimensional space
Grain boundaries (GBs) in polycrystalline and nanocrystalline materials are rarely flat, and their curvatures often evolve dynamically in three-dimensional (3D) GB network under thermomechanical stimulations. However, the complexity of polycrystalline microstructure greatly hinders our understanding...
| Main Authors: | , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/175857 |
| _version_ | 1826123495794278400 |
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| author | Chen, Yingbin Han, Jian Deng, Hailin Cao, Guang Zhang, Ze Zhu, Qi Zhou, Haofei Srolovitz, David J. Wang, Jiangwei |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Chen, Yingbin Han, Jian Deng, Hailin Cao, Guang Zhang, Ze Zhu, Qi Zhou, Haofei Srolovitz, David J. Wang, Jiangwei |
| author_sort | Chen, Yingbin |
| collection | NTU |
| description | Grain boundaries (GBs) in polycrystalline and nanocrystalline materials are rarely flat, and their curvatures often evolve dynamically in three-dimensional (3D) GB network under thermomechanical stimulations. However, the complexity of polycrystalline microstructure greatly hinders our understanding of GB kinetics with 3D crystallographic clarity, especially at atomic scale. Here, we reveal a disconnection-based mechanism of GB kinetics in 3D space, by combining atomic-resolution in situ nanomechanical testing and atomistic simulations. Upon loading, GB can gradually adjust its curvature in 3D via sequential nucleation, propagation and annihilation of curved disconnections, where anisotropic mobilities of different disconnection segments induce a dynamic GB curving in 3D. Such curved disconnection-mediated GB curving and migration can coordinate among multiple GBs, and contribute to 3D grain growth/annihilation in GB networks. This curved disconnection-based 3D GB kinetics elucidates a long-elusive perspective in GB deformation, significantly advancing current knowledge of GB-mediated plasticity in metallic materials. |
| first_indexed | 2024-10-01T06:05:36Z |
| format | Journal Article |
| id | ntu-10356/175857 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:05:36Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1758572024-05-08T04:50:46Z Revealing grain boundary kinetics in three-dimensional space Chen, Yingbin Han, Jian Deng, Hailin Cao, Guang Zhang, Ze Zhu, Qi Zhou, Haofei Srolovitz, David J. Wang, Jiangwei School of Mechanical and Aerospace Engineering Engineering Nanocrystalline material Grain boundary Grain boundaries (GBs) in polycrystalline and nanocrystalline materials are rarely flat, and their curvatures often evolve dynamically in three-dimensional (3D) GB network under thermomechanical stimulations. However, the complexity of polycrystalline microstructure greatly hinders our understanding of GB kinetics with 3D crystallographic clarity, especially at atomic scale. Here, we reveal a disconnection-based mechanism of GB kinetics in 3D space, by combining atomic-resolution in situ nanomechanical testing and atomistic simulations. Upon loading, GB can gradually adjust its curvature in 3D via sequential nucleation, propagation and annihilation of curved disconnections, where anisotropic mobilities of different disconnection segments induce a dynamic GB curving in 3D. Such curved disconnection-mediated GB curving and migration can coordinate among multiple GBs, and contribute to 3D grain growth/annihilation in GB networks. This curved disconnection-based 3D GB kinetics elucidates a long-elusive perspective in GB deformation, significantly advancing current knowledge of GB-mediated plasticity in metallic materials. J.W. acknowledges the financial support from the National Natural Science Foundation of China (52071284). H.Z. acknowledges the financial support from the National Natural Science Foundation of China (12172324, 12222210) and the computational support from the Beijing Super Cloud Computing Center. D.J.S. acknowledges the financial support of the Research Grants Council of Hong Kong (17210723). J.H. acknowledges support of the Early Career Scheme (ECS) grant from the Hong 259 Kong Research Grants Council City U21213921. 2024-05-08T04:50:46Z 2024-05-08T04:50:46Z 2024 Journal Article Chen, Y., Han, J., Deng, H., Cao, G., Zhang, Z., Zhu, Q., Zhou, H., Srolovitz, D. J. & Wang, J. (2024). Revealing grain boundary kinetics in three-dimensional space. Acta Materialia, 268, 119717-. https://dx.doi.org/10.1016/j.actamat.2024.119717 1359-6454 https://hdl.handle.net/10356/175857 10.1016/j.actamat.2024.119717 2-s2.0-85185200114 268 119717 en Acta Materialia © 2024 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering Nanocrystalline material Grain boundary Chen, Yingbin Han, Jian Deng, Hailin Cao, Guang Zhang, Ze Zhu, Qi Zhou, Haofei Srolovitz, David J. Wang, Jiangwei Revealing grain boundary kinetics in three-dimensional space |
| title | Revealing grain boundary kinetics in three-dimensional space |
| title_full | Revealing grain boundary kinetics in three-dimensional space |
| title_fullStr | Revealing grain boundary kinetics in three-dimensional space |
| title_full_unstemmed | Revealing grain boundary kinetics in three-dimensional space |
| title_short | Revealing grain boundary kinetics in three-dimensional space |
| title_sort | revealing grain boundary kinetics in three dimensional space |
| topic | Engineering Nanocrystalline material Grain boundary |
| url | https://hdl.handle.net/10356/175857 |
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