液体固体接口 SCN-2wt%H 2 O 合金被调查面对砍流动。砍,这被发现了流动惊人地在更低的拉提高平面接口的稳定性率。在拉率的中间的范围,接口经历期刊震荡“平面细胞”、“细胞树枝状”的生长模式。震荡的生长模式的形成能被二个原因解释:稳定的效果导致了由的(i) 砍流动与成长使动摇竞争由拉率的增加完成,它为词法进化提供驱动力;并且(i i ) 在液体固体接口的稳定的溶质地的建立需要时间的一个时期,导致接口进化不能呆在的结果以平衡状态稳定。然而,当呜咽的率变得更高,它在模式选择和树枝状的生长表格起越来越重要的作用。
Liquid-solid interface morphological evolution of SCN-2wt%H2O alloy was investigated in the presence of shear flow. It has been found that shear flow strikingly enhances the stability of planar interface at lower pulling rates. In the intermediate range of pulling rate, the interface experiences periodical oscillating "planar-cellular" and "cellular-dendritic" growth patterns. The formation of oscillating growth modes can be explained by two reasons: (i) The stabilizing effect induced by shear flow competes with the growing destabilizing effect by the increase of pulling rate, which provides the driving force for morphological evolution; and (ii) the establishment of stable solute field at the liquid-solid interface needs a period of time, leading to the result that the interface evolution can not stay stable at the equilibrium state. However, as the puling rate becomes higher, it plays more and more important roles in pattern selection and dendritic growth forms.