Quantitatively comparing phase-field modeling with direct real time observation by synchrotron X-ray radiography of the initial transient during directional solidification of an Al-Cu alloy
文献类型：期刊论文
| 作者 | Y. Chen ; A. A. Bogno ; N. M. Xiao ; B. Billia ; X. H. Kang ; H. Nguyen-Thi ; X. H. Luo ; D. Z. Li |
| 刊名 | Acta Materialia
 |
| 出版日期 | 2012 |
| 卷号 | 60期号:1页码:199-207 |
| 关键词 | Phase-field model Directional solidification Alloys Real time synchrotron observation Natural convection free dendritic growth binary alloy in-situ aluminum-alloy microstructures simulation interface computation prediction |
| ISSN号 | 1359-6454 |
| 中文摘要 | The initial transient during directional solidification of an Al-4 wt.% Cu alloy was simulated by a quantitative phase-field model solved with the adaptive finite element method. The simulated solidification process was compared with the related analytical theory and in situ and real time observations by means of X-ray radiography at the European Synchrotron Radiation Facility. The simulated velocity of the planar interface and solute profile ahead of the solidification front in the liquid are close to the predictions of the Warren-Langer model of the initial planar solidification transient, but in fair quantitative agreement with experimental results only at early stages of planar solidification. After the accelerated flat interface lost its stability a transition to cellular solidification was initiated. The initial cell spacing predicted by the phase-field simulation agreed well with the experimental observations in the region where the cell growth direction was perpendicular to the fluid flow, whereas a discrepancy was obvious in the corners where the fluid flow was parallel to growth. An analytical relation describing the wavelength of the initial solid-liquid interface corrugations under diffusion-limited transport is screened out by comparing the phase-field simulation data with expressions based upon the Mullins-Sekerka linear stability analysis theory or derived for primary spacing. The gravity-driven natural convection in the experiment resulted in misfits between the phase-field predictions and the experimental observations in the late stage of planar solidification, onset and development of morphological instability. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2013-02-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/59910]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | Y. Chen,A. A. Bogno,N. M. Xiao,et al. Quantitatively comparing phase-field modeling with direct real time observation by synchrotron X-ray radiography of the initial transient during directional solidification of an Al-Cu alloy[J]. Acta Materialia,2012,60(1):199-207. |
| APA | Y. Chen.,A. A. Bogno.,N. M. Xiao.,B. Billia.,X. H. Kang.,...&D. Z. Li.(2012).Quantitatively comparing phase-field modeling with direct real time observation by synchrotron X-ray radiography of the initial transient during directional solidification of an Al-Cu alloy.Acta Materialia,60(1),199-207. |
| MLA | Y. Chen,et al."Quantitatively comparing phase-field modeling with direct real time observation by synchrotron X-ray radiography of the initial transient during directional solidification of an Al-Cu alloy".Acta Materialia 60.1(2012):199-207. |
入库方式： OAI收割
来源：金属研究所
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