Atomic-scale Nucleation and Growth Pathway of Complex Plate-like Precipitates in Aluminum Alloys
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866929551574040576 |
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| author | Bai, Junyuan Qin, Gaowu Pang, Xueyong Zhao, Zhihao |
| author_facet | Bai, Junyuan Qin, Gaowu Pang, Xueyong Zhao, Zhihao |
| contents | Aluminum alloys, the most widely utilized lightweight structural materials, predominantly depend on coherent complex-structured nano-plates to enhance their mechanical properties. Despite several decades of research, the atomic-scale nucleation and growth pathways for these complex-structured nano-plates remain elusive, as probing and simulating atomic events like solid nucleation is prohibitively challenging. Here, using theoretical calculations and focus on three representative complex-structured nano-plates in commercial Al alloys, we explicitly demonstrate their associated structural transitions follow an inter-layer-sliding+shuffling mode. Specifically, partial dislocations complete the inter-layer-sliding stage, while atomic shuffling occurs upon forming the unstable basic structural transformation unit of the nano-plates. By identifying these basic structural transformation units, we propose structural evolution pathways for these nano-plates within the Al matrix, which align well with experimental observations and enable the evaluation of critical nuclei. These findings provide long-sought mechanistic details into how coherent nano-plates nucleate and grow, facilitating the rational design of higher-performance Al alloys and other structural materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_15255 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Atomic-scale Nucleation and Growth Pathway of Complex Plate-like Precipitates in Aluminum Alloys Bai, Junyuan Qin, Gaowu Pang, Xueyong Zhao, Zhihao Materials Science Aluminum alloys, the most widely utilized lightweight structural materials, predominantly depend on coherent complex-structured nano-plates to enhance their mechanical properties. Despite several decades of research, the atomic-scale nucleation and growth pathways for these complex-structured nano-plates remain elusive, as probing and simulating atomic events like solid nucleation is prohibitively challenging. Here, using theoretical calculations and focus on three representative complex-structured nano-plates in commercial Al alloys, we explicitly demonstrate their associated structural transitions follow an inter-layer-sliding+shuffling mode. Specifically, partial dislocations complete the inter-layer-sliding stage, while atomic shuffling occurs upon forming the unstable basic structural transformation unit of the nano-plates. By identifying these basic structural transformation units, we propose structural evolution pathways for these nano-plates within the Al matrix, which align well with experimental observations and enable the evaluation of critical nuclei. These findings provide long-sought mechanistic details into how coherent nano-plates nucleate and grow, facilitating the rational design of higher-performance Al alloys and other structural materials. |
| title | Atomic-scale Nucleation and Growth Pathway of Complex Plate-like Precipitates in Aluminum Alloys |
| topic | Materials Science |
| url | https://arxiv.org/abs/2410.15255 |