Dendritic Crystal Growth Evolution of Al-2.6Cu Alloy under Different Supersaturation Conditions
In this paper, dendritic crystal growth evolution of Al-2.6Cu (at.%) alloy are investigated by using the phase-field model coupling concentration field equations under different supersaturation conditions. The calculated results indicate that the supersaturation, which is larger in lower initial temperature, plays a very important role in dendritic crystal growth and microsegregation. With the initial temperature decreasing and supersaturation increasing, secondary branches change from sparseness, thickness, and disappearing. The larger supersaturation causes higher faster dendrite growth velocity and solid phase ratio. The change of microsegregation degree is correspondingly complicated. When initial temperature is higher than 829K, the microsegregation degree increases. When the initial temperature lower than 829K, the microsegregation degree reduces rapidly. The simulated results agree well with the solidification theory.
KeywordsNumerical Simulation phase-field model dendrite growth microsegregation Al-Cu alloy
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