Journal
ACTA MATERIALIA
Volume 56, Issue 11, Pages 2663-2668Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.01.038
Keywords
faceted dendrite; solid/liquid interface; silicon; undercooling; twin boundary
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We directly observed the transition of crystal growth behavior of Si in a low undercooling region. We succeeded in observing the initiation of faceted dendrite growth from a portion of parallel twins with increasing degrees of undercooling. The critical undercooling for growing a faceted dendrite was experimentally determined to be Delta T= 10 K. We also confirmed that parallel twins associated with faceted dendrite growth were formed between grain boundaries and not at grain boundaries during melt growth. The parallel-twin formation was explained in terms of a model of twin formation on the {111} facet plane at the growth interface. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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