中文摘要：

对直径为4mm的Sn-0．65％Cd合金在行波磁场中进行定向凝固，结果发现其界面形貌是丰富多样的。在向上的行波磁场上，随着磁场强度的增大（B〈10．3mT），平界面和胞状界面交替转变。当加载向下的弱强度的行波磁场（B=3．2mT）时，界面形貌由浅胞状向深胞状转变。当磁场强度进一步增大时，界面两侧呈现微弱的不一致，但是在强的磁场下界面形貌大致趋向于平界面（B≤10．3mT）。这种界面的不稳定性可能归因于行波磁场驱动的流动。另外，在向上的行波磁场中界面形状几乎是水平的，但是在向下的行波磁场中界面形状是倾斜的。

英文摘要：

The diversity of interface morphologies is observed for directionally solidified Sn-0.65%Cd alloy under a travelling magnetic field （TMF） in the 4 mm-diameter sample. Under an upward TMF, planar and cellular interface morphologies transform alternately with increasing magnetic flux density （B≤10.3 mT）. The interface morphology transforms from shallow cellular to deep cellular morphology under a weak downward TMF （B=3.2 mT）. When the magnetic flux density increases further, both sides of the interface morphology appear to be slightly inconsistent, but they roughly tend to be planar under a strong downward TMF （BS10.3 mT）. The interface instability may be attributed to the flow driven by the TMF. Moreover, the shape of interface appears to be almost flat under an upward TMF, but deflective under a downward TMF.