Faceted dendrite growth of silicon from undercooled melt of Si-Ni alloy

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Abstract

Two-dimensional faceted dendrite growth of silicon from undercooled melt of Si-6 wt%Ni alloy was experimentally investigated, in which molten alloy film from 10 to 20 μm in thickness was undercooled up to 115 K and growing dendrites were observed in situ. Both the in situ observation of dendrite morphology and the EBSP crystallographic analysis for solidified samples showed that both a 〈2 1 1〉 twin dendrite and a 〈1 0 0〉 twin-free dendrite grew in the range of undercooling from 50 to 115 K. Dendrite growth velocity was also measured for different undercooling conditions. The growth velocity of 〈2 1 1〉 dendrites was slightly larger than that of 〈1 0 0〉 dendrites. It is concluded that the upper envelope of the data provide the correct dendrite growth velocity and it is compared with that obtained by phase-field simulations. Growth velocity in both follows power relationships to undercooling and the linear kinetic coefficient is estimated to be 0.01 m/s K. © 2006 NIMS and Elsevier Ltd.

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Kuniyoshi, K., Ozono, K., Ikeda, M., Suzuki, T., Gyoon Kim, S., & Tae Kim, W. (2006). Faceted dendrite growth of silicon from undercooled melt of Si-Ni alloy. Science and Technology of Advanced Materials, 7(6), 595–600. https://doi.org/10.1016/j.stam.2006.06.001

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