Three-dimensional nucleation and growth of deformation twins in magnesium
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866915475937558528 |
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| author | Lee, Sangwon Pilipchuk, Michael Yildirim, Can Greeley, Duncan Shi, Qianying Berman, Tracy D. Creuziger, Adam Rust, Evan Detlefs, Carsten Sundararaghavan, Veera Allison, John E. Bucsek, Ashley |
| author_facet | Lee, Sangwon Pilipchuk, Michael Yildirim, Can Greeley, Duncan Shi, Qianying Berman, Tracy D. Creuziger, Adam Rust, Evan Detlefs, Carsten Sundararaghavan, Veera Allison, John E. Bucsek, Ashley |
| contents | At two-thirds the weight of aluminum, magnesium alloys have the potential to significantly reduce the fuel consumption of transportation vehicles. These advancements depend on our ability to optimize the desirable versus undesirable effects of deformation twins: three dimensional (3D) microstructural domains that form under mechanical stresses. Previously only characterized using surface or thin-film measurements, here, we present the first 3D in-situ characterization of deformation twinning inside an embedded grain over mesoscopic fields of view using dark-field X-ray microscopy supported by crystal plasticity finite element analysis. The results reveal the important role of triple junctions on twin nucleation, that twin growth behavior is irregular and can occur in several directions simultaneously, and that twin-grain and twin-twin junctions are the sites of localized dislocation accumulation, a necessary precursor to crack initiation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_16640 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Three-dimensional nucleation and growth of deformation twins in magnesium Lee, Sangwon Pilipchuk, Michael Yildirim, Can Greeley, Duncan Shi, Qianying Berman, Tracy D. Creuziger, Adam Rust, Evan Detlefs, Carsten Sundararaghavan, Veera Allison, John E. Bucsek, Ashley Materials Science At two-thirds the weight of aluminum, magnesium alloys have the potential to significantly reduce the fuel consumption of transportation vehicles. These advancements depend on our ability to optimize the desirable versus undesirable effects of deformation twins: three dimensional (3D) microstructural domains that form under mechanical stresses. Previously only characterized using surface or thin-film measurements, here, we present the first 3D in-situ characterization of deformation twinning inside an embedded grain over mesoscopic fields of view using dark-field X-ray microscopy supported by crystal plasticity finite element analysis. The results reveal the important role of triple junctions on twin nucleation, that twin growth behavior is irregular and can occur in several directions simultaneously, and that twin-grain and twin-twin junctions are the sites of localized dislocation accumulation, a necessary precursor to crack initiation. |
| title | Three-dimensional nucleation and growth of deformation twins in magnesium |
| topic | Materials Science |
| url | https://arxiv.org/abs/2412.16640 |