In situ synchrotron X-ray studies of the coupled effects of thermal and solutal supercoolings on the instability of dendrite growth

Li, Faguo; Zhang, Jiao; Dong, Qing; Dai, Yongbing; Fu, Yanan; Xie, Honglan; Mi, J.; Yin, Fucheng; Sun, Baode

doi:10.1016/j.matchar.2015.09.008

In situ synchrotron X-ray studies of the coupled effects of thermal and solutal supercoolings on the instability of dendrite growth

Li, Faguo; Zhang, Jiao; Dong, Qing; Dai, Yongbing; Fu, Yanan; Xie, Honglan; Mi, J.; Yin, Fucheng; Sun, Baode

Authors

Faguo Li

Jiao Zhang

Qing Dong

Yongbing Dai

Yanan Fu

Honglan Xie

Professor Jiawei Mi J.Mi@hull.ac.uk
Professor of Materials

Fucheng Yin

Baode Sun

Abstract

© 2015 Elsevier Inc. All rights reserved. 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.

Citation

Li, F., Zhang, J., Dong, Q., Dai, Y., Fu, Y., Xie, H., Mi, J., Yin, F., & Sun, B. (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. https://doi.org/10.1016/j.matchar.2015.09.008

Journal Article Type	Article
Acceptance Date	Sep 4, 2015
Online Publication Date	Sep 12, 2015
Publication Date	Nov 1, 2015
Deposit Date	Apr 11, 2022
Journal	Materials Characterization
Print ISSN	1044-5803
Publisher	Elsevier
Peer Reviewed	Peer Reviewed
Volume	109
Pages	9-18
DOI	https://doi.org/10.1016/j.matchar.2015.09.008
Keywords	Morphology; Dendrite formation; X-ray radiography; Aluminum alloys; Doublon
Public URL	https://hull-repository.worktribe.com/output/3607220