In situ study the effect of refiner on the microstructure evolution of variable cross-section structure by synchrotron X-ray radiography
Li, FG; Zhang, J; Dai, YB; Bian, FG; Fu, YA; Yin, FC; Sun, BD; Zhang, J (reprint author), Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China.
2015
发表期刊JOURNAL OF CRYSTAL GROWTH
ISSN0022-0248
卷号428页码:1—7
文章类型期刊文献
摘要The formation of microstructures during solidification is strongly affected by the interaction that occurs between factors, such as heat field, melt flow, solute distribution, and number of effective nucleation cores. In this study, the microstructure evolution of a high-purity hypoeutectic Al-Cu alloy at its region of variable cross-section was studied using synchrotron radiation imaging. The characteristics of the thermal field, solute field, and flow field were analyzed according to these radiographs. The results showed that the region of variable cross-section is the site that is more prone to dendrite arms fracture. These dendrites spread radially from the center of the thin wall and the isotherms distribute as an arc-shape. These are the main reasons for the uneven distribution of the microstructure, which lead to undesirable phase formation and aggregation at the region of variable cross-section. The microstnicture can be significantly refined and solute enrichment can be eliminated by adding refiners to alloys. Comparing these two conditions, it can be concluded that the solute and flow field distribution at the variable cross-section region is significantly affected, uniformity of the solidification microstructure is improved, and undesirable phases are eliminated by increase in effective heterogeneous nucleation cores. (C) 2015 Elsevier B.V. All rights reserved.
关键词Directional Solidification Grain-refinement Unidirectional Solidification Equiaxed Growth Columnar Front Aluminum Alloys Fragmentation Prediction
语种英语
WOS记录号WOS:000360501200001
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/24957
专题中科院上海应用物理研究所2011-2018年
通讯作者Zhang, J (reprint author), Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China.
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GB/T 7714
Li, FG,Zhang, J,Dai, YB,et al. In situ study the effect of refiner on the microstructure evolution of variable cross-section structure by synchrotron X-ray radiography[J]. JOURNAL OF CRYSTAL GROWTH,2015,428:1—7.
APA Li, FG.,Zhang, J.,Dai, YB.,Bian, FG.,Fu, YA.,...&Zhang, J .(2015).In situ study the effect of refiner on the microstructure evolution of variable cross-section structure by synchrotron X-ray radiography.JOURNAL OF CRYSTAL GROWTH,428,1—7.
MLA Li, FG,et al."In situ study the effect of refiner on the microstructure evolution of variable cross-section structure by synchrotron X-ray radiography".JOURNAL OF CRYSTAL GROWTH 428(2015):1—7.
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