Dendrites are the snowflake-like shapes in metal microstructures. These are different in nature and origin than lamellar structures from eutectic or eutectoid reactions. These come about because of instabilities along solid-liquid interfaces. If your solid material absorbs a large heat of solidification then the liquid can be at a lower temperature than the interface and therefore a protuberance sticking out into the liquid has a driving force to persist and grow. Then protuberances can grow off the side giving rise to the characteristic dendritic microstructure.
Негізгі бет Ғылым және технология Why do dendrites form in metal alloys?
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