Secondary Grain Boundary Dislocations Alter Segregation Energy Spectra
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866916482715222016 |
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| author | Chen, Xinren Gonçalves, William Hu, Yi Gao, Yipeng Harrison, Patrick Das, Saurabh Mohan Dehm, Gerhard Gault, Baptiste Ludwig, Wolfgang Rauch, Edgar Zhou, Xuyang Raabe, Dierk |
| author_facet | Chen, Xinren Gonçalves, William Hu, Yi Gao, Yipeng Harrison, Patrick Das, Saurabh Mohan Dehm, Gerhard Gault, Baptiste Ludwig, Wolfgang Rauch, Edgar Zhou, Xuyang Raabe, Dierk |
| contents | Grain boundaries (GBs) trigger structure-specific chemical segregation of solute atoms. According to the three-dimensional (3D) topology of grains, GBs - although defined as planar defects - cannot be free of curvature. This implies formation of topologically-necessary arrays of secondary GB dislocations. We report here that these pattern-forming secondary GB dislocations can have an additional and, in some cases, even a much stronger effect on GB segregation than defect-free GBs. Using nanoscale correlative tomography combining crystallography and chemical analysis, we quantified the relationship between secondary GB dislocations and their segregation energy spectra for a model Fe-W alloy. This discovery unlocks new design opportunities for advanced materials, leveraging the additional degrees of freedom provided by topologically-necessary secondary GB dislocations to modulate segregation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_10350 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Secondary Grain Boundary Dislocations Alter Segregation Energy Spectra Chen, Xinren Gonçalves, William Hu, Yi Gao, Yipeng Harrison, Patrick Das, Saurabh Mohan Dehm, Gerhard Gault, Baptiste Ludwig, Wolfgang Rauch, Edgar Zhou, Xuyang Raabe, Dierk Materials Science Grain boundaries (GBs) trigger structure-specific chemical segregation of solute atoms. According to the three-dimensional (3D) topology of grains, GBs - although defined as planar defects - cannot be free of curvature. This implies formation of topologically-necessary arrays of secondary GB dislocations. We report here that these pattern-forming secondary GB dislocations can have an additional and, in some cases, even a much stronger effect on GB segregation than defect-free GBs. Using nanoscale correlative tomography combining crystallography and chemical analysis, we quantified the relationship between secondary GB dislocations and their segregation energy spectra for a model Fe-W alloy. This discovery unlocks new design opportunities for advanced materials, leveraging the additional degrees of freedom provided by topologically-necessary secondary GB dislocations to modulate segregation. |
| title | Secondary Grain Boundary Dislocations Alter Segregation Energy Spectra |
| topic | Materials Science |
| url | https://arxiv.org/abs/2411.10350 |