The samples of Al-35%La alloy with different directional solidification velocities (0.05 ~ 4mm.s^-1) were prepared by adopting directional solidification method. The feature of the dendrite structure of these samples was studied. It is found that, when the directional solidification velocity was 0.05mm.s^-1 during directional solidification, the samples have obvious directionality and have a periodic diphase dendrite structure; when the directional solidification velocity were 0.2 ~ 1 mm.s^-1, the dendrite growth direction clutters without a certain direction, the periodic diphase dendrite structure are shown, and it is difficult to obtain the directional solidification structure; when the directional solidification velocity was 3 mm.s^-1, the structure feature of directional solidification periodic diphase dendrite was more obvious, as shown in Figure 1. The results show that the microstructure and morphology of the periodic diphase dendrite of Al-35%La is closely related with its growth rate to the directional solidification conditions. It was periodic diphase dendrite structure along the growth direction, and dendrite growth direction perpendicular to the direction of the faster growing, forming a box-shaped periodic diphase dendrite structure.

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