In situ synchrotron X-ray studies of the coupled effects of thermal and solutal supercoolings on the instability of dendrite growth
作者： Faguo Li , Jiao Zhang , Qing Dong , Yongbing Dai , Yanan Fu
DOI: 10.1016/J.MATCHAR.2015.09.008
关键词:
摘要: Special growth pattern representing unique conditions is a vital clue to investigate the morphology evolution mechanism in metallic alloy solidification. The dendrite and orientation of dendritic doublons hypoeutectic Al-Cu have been studied by synchrotron radiation imaging technology electron back scatter diffraction. results show that this kind doublon two-dimensional secondary arms grow perpendicularly primary stem. This can appear as an equiaxed grain, columnar dendrite, or coexist with regular dendrite. directions tips are , respectively. Rising cooling rate Cu concentration alloys facilitates formation doublonic structure. According kinetic diagram (pattern-dimensionless supercooling-anisotropy) obtained from experimental data, forming region was above boundary fractal compact (C) 2015 Elsevier Inc All rights reserved.
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