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HomeMaterials Science ForumMaterials Science Forum Vol. 817Dendritic Growth Characteristics of Cu-Rich Zone...

Dendritic Growth Characteristics of Cu-Rich Zone within Phase Separated Fe₅₀Cu₅₀ Alloy

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Abstract:

The undercooled Fe₅₀Cu₅₀ alloy experiences a metastable liquid phase separation and separates into a Fe-rich zone and a Cu-rich zone within the gravity field. The growth characteristics of the Cu-rich zone were investigated by the glass fluxing method, and the achieved undercooling range was 20−261 K. The volume fraction of the Cu-rich zone decreases with the enhancement of the bulk undercooling. The microstructural morphologies of the Cu-rich zone are similar at all the undercooling conditions, that is, αFe dendrites and particles are distributed inside (Cu) phase matrix. The secondary dendritic arm spacing of αFe dendrites decreases with the increase in bulk undercooling. The growth mechanism of αFe dendrites was analyzed by using the LKT/BCT dendritic growth theory. The dendritic growth in the Cu-rich zone is mainly controlled by solute diffusion so that the dendritic growth velocity is only several millimeters per second. Besides, the calculated results indicate that there is only inconspicuous solute trapping during the solidification of Cu-rich zone.

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Basic Research of Materials

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Periodical:

Materials Science Forum (Volume 817)

Pages:

299-306

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https://doi.org/10.4028/www.scientific.net/MSF.817.299

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Online since:

April 2015

Authors:

Sheng Bao Luo, Wei Li Wang, Liu Hui Li, Zhen Chao Xia, Bing Bo Wei*

Keywords:

Dendritic Growth, Phase Separation, Undercooling

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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