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Consider the case of a binary eutectic alloy of elements A and B. An A-rich solid phase is forming from a liquid which is a solution of A and B. Liquid which has a higher concentration of B appears more green. As the A-rich phase forms, element B is ejected into the liquid, creating a region of B-rich liquid ahead of the interface.
 
 
Consider the case of a binary eutectic alloy of elements A and B. An A-rich solid phase is forming from a liquid which is a solution of A and B. Liquid which has a higher concentration of B appears more green. As the A-rich phase forms, element B is ejected into the liquid, creating a region of B-rich liquid ahead of the interface.
CL
C0
Solute profile between primary arms
Interface
Tip
 
 
Another growth front morphology, between the dendritic and planar extremes, is cellular growth, where only primary dendrite arms form.
CL
C0
Solute profile between primary arms