Abstract
An analytical model is developed to calculate the segregation behavior of a micro-alloying element to the liquid/liquid interface and its effect on the liquid/liquid interfacial energy during the solidification of a monotectic alloy based on the thermodynamics of alloys. Experiments are carried out with Al-Bi alloy micro-alloyed by different elements. The model is verified by the experimental results. Calculation results demonstrate that, for an A-B monotectic system, the segregation behavior of the micro-alloying element i depends on the partition coefficient Ki (ratio of the mole fraction of i in the B-rich melt to that in the A-rich melt), which is closely related to the atomic interaction energy parameters LA-i for the A-i binary alloy, LB-i for the B-i binary alloy, LA-B for the A-B binary alloy. A simple but efficient criterion is proposed based on Ki for choosing the interface active element i for the A-B monotectic alloy: KA < Ki < KB.
Published Version
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