In situ synchrotron X-ray studies of the coupled effects of thermal and solutal supercoolings on the instability of dendrite growth
Li, FG; Zhang, J; Dong, Q; Dai, YB; Fu, YA; Xie, HL; Mi, J; 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MATERIALS CHARACTERIZATION
ISSN1044-5803
卷号109页码:9—18
文章类型期刊文献
摘要Special growth pattern representing unique growth conditions is a vital clue to investigate the morphology evolution mechanism in metallic alloy solidification. The dendrite pattern and growth orientation of dendritic doublons in the hypoeutectic Al-Cu alloy have been studied by synchrotron radiation imaging technology and electron back scatter diffraction. The results show that this kind of doublon is two-dimensional and the secondary arms grow perpendicularly to the primary stem. This doublon morphology can appear as an equiaxed grain, columnar dendrite, or coexist with a regular dendrite. The growth directions of the dendritic doublon tips and the secondary arms are < 110 > and < 001 >, respectively. Rising cooling rate or Cu concentration in the alloys facilitates the formation of the doublonic structure. According to the kinetic morphology diagram of Al-Cu alloys (pattern-dimensionless supercooling-anisotropy) obtained from the experimental data, the dendritic doublon forming region was above the boundary of fractal dendrite and compact dendrite. (C) 2015 Elsevier Inc All rights reserved.
关键词Directional Solidification Diffusional Growth Morphology Diagram Interfacial Energy Aluminum-alloys Anisotropy Stability Crystal Radiography Simulation
语种英语
WOS记录号WOS:000365365400002
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/24958
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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Li, FG,Zhang, J,Dong, Q,et al. In situ synchrotron X-ray studies of the coupled effects of thermal and solutal supercoolings on the instability of dendrite growth[J]. MATERIALS CHARACTERIZATION,2015,109:9—18.
APA Li, FG.,Zhang, J.,Dong, Q.,Dai, YB.,Fu, YA.,...&Zhang, J .(2015).In situ synchrotron X-ray studies of the coupled effects of thermal and solutal supercoolings on the instability of dendrite growth.MATERIALS CHARACTERIZATION,109,9—18.
MLA Li, FG,et al."In situ synchrotron X-ray studies of the coupled effects of thermal and solutal supercoolings on the instability of dendrite growth".MATERIALS CHARACTERIZATION 109(2015):9—18.
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