Impact of growth velocity on grain structure formation during directional solidification of a refined Al-20wt.%Cu alloy
| Autor: | H. Soltani, M. Zahzouh, F. Ngomesse, Guillaume Reinhart, Henri Nguyen-Thi, M.C. Benoudia |
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| Přispěvatelé: | Université Badji Mokhtar - Annaba [Annaba] (UBMA), Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Ecole Nationale Supérieure des Mines et de la Métallurgie, L3M, Université Badji Mokhtar Annaba (UBMA), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), GDR 2799 Micropesanteur Fondamentale & Appliquée |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Equiaxed crystals
Materials science Directional solidification Characterization Alloy Nucleation 02 engineering and technology engineering.material 01 natural sciences [SPI.MAT]Engineering Sciences [physics]/Materials Inorganic Chemistry 0103 physical sciences Materials Chemistry Alloys Composite material 010302 applied physics Isotropy [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Grain size Characterization (materials science) A1. Nucleation Temperature gradient A1. Dendrites Metals engineering [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 0210 nano-technology |
| Zdroj: | Journal of Crystal Growth Journal of Crystal Growth, Elsevier, 2020, 548, pp.125819. ⟨10.1016/j.jcrysgro.2020.125819⟩ Journal of Crystal Growth, 2020, 548, pp.125819. ⟨10.1016/j.jcrysgro.2020.125819⟩ |
| ISSN: | 0022-0248 |
| DOI: | 10.1016/j.jcrysgro.2020.125819⟩ |
| Popis: | The paper presents detailed analyses of solidification experiments performed on a refined Al-20 wt.%Cu alloy using the SFINX (Solidification Furnace with IN situ X-radiography) laboratory facility. Directional solidifications of a sheet-like sample were carried out in a horizontal configuration, with the main surface of the sample parallel to the ground. The sample was solidified for a wide range of cooling rates to obtain various grain structures, from columnar to elongated and equiaxed. The formation of the grain structure was observed in-situ and in real-time by X-radiography, which allows the dynamic of solidification phenomena to be thoroughly analyzed. Based on the radiographs, quantitative measurements were performed to accurately describe the solidified grain structure, namely the nucleation position, nucleation rate, grain size, grain elongation factor and growth orientation. The experiments showed that increasing the growth velocity leads to a decrease of both the grain size and grain elongation factor, resulting in a more homogeneous and isotropic grain distribution. The grain characteristic parameters were also sensitive to variations of the temperature gradient in the Field-of-View. The results were discussed by analyzing the impact of the solidification parameters on the constitutionally undercooled liquid zone ahead of the solidification front. |
| Databáze: | OpenAIRE |
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