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中文摘要：
利用高速摄影仪和SEM研究了RE对A1-80％Si合金凝固过程中再辉界面形貌、初生Si形貌和凝固后组织的影响．结果发现，加入RE前后的A1．80％Si合金均存在2个临界过冷度△T1和△T2,在过冷度小于△T1时、初生Si的形貌为粗大的长片状，表面有明显的棱角；过冷度大于△正后，合金在凝固过程中的再辉界面为平面状，凝固后的初生Si形貌为均匀、细小、表面有光滑凸起的球状，并且晶粒表面的棱角消失；当过冷度在△T1和△T2之间时，合金在凝固过程中的再辉界面为树枝状，凝固后的初生Si形貌部分为表面有棱角的片状和块状，部分为表面无棱角的球状．对于A1．80％Si合金而言，△T1和△T2分别约为132和250K．RE能降低A1—80％Si合金△兀和△五的值，对于A1—80％Si．I％RE而言，△T1和△T2分别约为60和199K．
英文摘要：
Effects of rare earth （RE） on the morphologies of the recalescence interface, the growing primary Si during the solidification process and the structure after solidification of A1-80% Si alloy were investigated by means of high speed camera and SEM. The critical undercooling △T1 and △T2 for the morphology transition of the recalescence interface, the growing primary Si and the structure have been obtained. When the undercooling is lower than △T1, the morphology of the growing crystal during the solidification process is flake-like; and the struc- ture after the solidification process is composed of large flake grains with pronounced edges and faces. When the undercooling is greater than △T1, the recalescence interface is a parallel one, and the structure after solidification is composed of homogenous and fine grains, and there exist several smooth spherical bulges on the surface of each grain. In the undercooling region from △T1 to △T2, the recalescence interface and the growing crystal show den- dritic features, but some of the dendrites are distributed regularly; after solidification, the structure is composed of refined equiaxed grains and flake grains. ForA1-80%Si alloy, △T1 and △T2 are equal to 132 and 250 K, respective- ly. RE can reduce the values of △T1 and △T2. When 1%RE is added into the alloy, △T1 and △T2 are changed to 60 and 199 K, respectively.
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