Phase boundary anisotropy and its effects on the maze-to-lamellar transition in a directionally solidified Al Al2Cu eutectic
| العنوان: | Phase boundary anisotropy and its effects on the maze-to-lamellar transition in a directionally solidified Al Al2Cu eutectic |
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| المؤلفون: | Ulrike Hecht, Sabine Bottin-Rousseau, Janin Eiken, Silvère Akamatsu |
| المساهمون: | ACCESS (GERMANY), Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | Acta Materialia Acta Materialia, Elsevier, 2019, 170, pp.268-277. ⟨10.1016/j.actamat.2019.03.035⟩ |
| بيانات النشر: | HAL CCSD, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | 010302 applied physics, Phase boundary, Materials science, Polymers and Plastics, Condensed matter physics, Plane (geometry), Metals and Alloys, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Surface energy, Electronic, Optical and Magnetic Materials, [SPI.MAT]Engineering Sciences [physics]/Materials, [NLIN.NLIN-PS]Nonlinear Sciences [physics]/Pattern Formation and Solitons [nlin.PS], Phase (matter), 0103 physical sciences, Ceramics and Composites, Lamellar structure, 0210 nano-technology, Anisotropy, ComputingMilieux_MISCELLANEOUS, Eutectic system, Directional solidification |
| الوصف: | Solid-solid phase boundary anisotropy is a key factor controlling the selection and evolution of non-faceted eutectic patterns during directional solidification. This is most remarkably observed during the so-called maze-to-lamellar transition. By using serial sectioning, we followed the spatio-temporal evolution of a maze pattern over long times in a large Al Al2Cu eutectic grain with known crystal orientation of the Al and Al2Cu phases, hence known crystal orientation relationship (OR). The corresponding phase boundary energy anisotropy (γ-plot) was also known, as being previously estimated from molecular-dynamics computations. The experimental observations reveal the time-scale of the maze-to-lamellar transition and shed light on the processes involved in the gradual alignment of the phase boundaries to one distinct energy minimum which nearly corresponds to one distinct plane from the family { 120 } A l | | { 110 } A l 2 C u . This particular plane is selected due to a crystallographic bias induced by a small disorientation of the crystals relative to the perfect OR. The symmetry of the OR is thus slightly broken, which promotes lamellar alignment. Finally, the maze-to-lamellar transition leaves behind a network of fault lines inherited from the phase boundary alignment process. In the maze pattern, the fault lines align along the corners of the Wulff shape, thus allowing us to propose a link between the pattern defects and missing orientations in the Wulff shape. |
| اللغة: | English |
| تدمد: | 1359-6454 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f36b0c60316c58ff40d0d5e05cab2b8 https://hal.archives-ouvertes.fr/hal-02100023 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....1f36b0c60316c58ff40d0d5e05cab2b8 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13596454 |
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