题目：
Numerical Investigation on the Motion of Free-Floating Crystals During DC Casting of Aluminum Alloys
作者：
Qipeng Dong, Hiromi Nagaumi, Haitao Zhang, Tianpeng Qu,
and Jingkun Wang
摘要：
Macrosegregation formed during direct chill (DC) casting of aluminum ingots will deteriorate the mechanical property of products. The characteristic of macrosegregation is reported to be affected by the free-flfloating crystals, which was proved to result in the center negative segregation. The motion of free-flfloating crystals in ingots
is numerically simulated. The model is developed to incorporate flfluid flflow, heat transfer, and the motion of free-flfloating crystals basing on the mixture model and Lagrangian approach. Efforts are made to investigate the motion of free-flfloating crystals in liquid and slurry zones during solidifification of casting process. In addition, distribution of the dendrites in mush and solidifified zones is also studied. The variation of macrosegregation with the inflfluence of free-flfloating crystals can be primarily clarifified according to the results.
