| Equiaxed dendritic growth in nearly isothermal conditions: A study combining in situ and real-time experiment with large-scale phase-field simulation | |
| Gong, Tongzhao1,2; Chen, Yun1; Li, Shanshan1,2; Cao, Yanfei1; Hou, Liyuan3; Li, Dianzhong1; Chen, Xing-Qiu1; Reinhart, Guillaume4; Nguyen-Thi, Henri4 | |
| Corresponding Author | Chen, Yun(chenyun@imr.ac.cn) |
| 2021-09-01 | |
| Source Publication | MATERIALS TODAY COMMUNICATIONS
 |
| Volume | 28Pages:12 |
| Abstract | The equiaxed dendritic growth of Al-Cu alloys in nearly isothermal temperature field under continuous cooling condition is studied using in situ and real-time observation of experiments by synchrotron X-ray radiography and large-scale quantitative two-dimensional (2D) phase-field (PF) simulations. It is revealed that the equiaxed dendritic morphology and the secondary dendritic arm spacing (SDAS) in the 2D PF simulations are in a reasonable agreement with the experimental data. Increasing the cooling rates results in a smaller SDAS, as predicted by the analytical Kattamis-Flemings model. The transformation kinetics of solid fraction can be described by the Johnson-Mehl-Avrami-Kologoromov (JMAK) theory, but quantitative differences between the experiments and 2D PF simulations are significant. The maximum solute concentration C-max in liquid is approximately equal to the equilibrium concentration, which depends on the undercooling rather than the cooling rate. But the minimum solute concentration C-min in solid decreases with the cooling rate, thus leading to a larger segregation ratio S-R = C-max/C-min. Moreover, the liquid gravity-driven natural convection is considered in simulations. The liquid flow slightly increases the SDAS but has no apparent effect on solid fraction, and the segregation ratio is slightly reduced by the liquid convection, which could be attributed to the almost same C-max and enlarged C-min. |
| Keyword | Equiaxed dendritic growth Polycrystalline solidification Phase-field method Large-scale simulation Synchrotron X-ray radiography |
| Funding Organization | Youth Innovation Promotion Asso-ciation CAS, the Science Challenge Project ; Project to Strengthen Industrial Development at the Grass-roots Level ; Special Scientific Projects of Inner Mongolia ; French National Space Center (CNES) |
| DOI | 10.1016/j.mtcomm.2021.102467 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Youth Innovation Promotion Asso-ciation CAS, the Science Challenge Project[TZ2016004] ; Project to Strengthen Industrial Development at the Grass-roots Level[TC190A4DA/35] ; Special Scientific Projects of Inner Mongolia ; French National Space Center (CNES)[174800/00] |
| WOS Research Area | Materials Science |
| WOS Subject | Materials Science, Multidisciplinary |
| WOS ID | WOS:000696965700003 |
| Publisher | ELSEVIER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/166988 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Chen, Yun |
| Affiliation | 1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 10016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 3.Chinese Acad Sci, Baotou Rare Earth R&D Ctr, Baotou 014000, Peoples R China 4.Aix Marseille Univ, Univ Toulon, IM2NP, CNRS, Marseille, France |
| Recommended Citation GB/T 7714 | Gong, Tongzhao,Chen, Yun,Li, Shanshan,et al. Equiaxed dendritic growth in nearly isothermal conditions: A study combining in situ and real-time experiment with large-scale phase-field simulation[J]. MATERIALS TODAY COMMUNICATIONS,2021,28:12. |
| APA | Gong, Tongzhao.,Chen, Yun.,Li, Shanshan.,Cao, Yanfei.,Hou, Liyuan.,...&Nguyen-Thi, Henri.(2021).Equiaxed dendritic growth in nearly isothermal conditions: A study combining in situ and real-time experiment with large-scale phase-field simulation.MATERIALS TODAY COMMUNICATIONS,28,12. |
| MLA | Gong, Tongzhao,et al."Equiaxed dendritic growth in nearly isothermal conditions: A study combining in situ and real-time experiment with large-scale phase-field simulation".MATERIALS TODAY COMMUNICATIONS 28(2021):12. |
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