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Dendrites typically grow along the direction
corresponding to the maximum in r. For fcc metals, the growth direction is
generally [100]; The quantity r is defined as the reversible
work necessary to form a unit area of crystal¨Cmelt interface.

ÕâÊdzö×Ô"Crystal¨CMelt Interfaces and Solidification Morphologies in Metals and Alloys", Æäʵ2¥˵µÄÒ²ÕýÊÇÎÒÎʵÄÔ­Òò.
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