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通过对高纯ＣＢｒ４－Ｘ模拟合金亚快速定向凝固的原位观测，展示了枝晶向细胞晶转变的形态演化过程，发现枝晶通过尖端开裂使测枝消失并伴随一次间距大幅度减小，转变过程中还出现尖端生长速度对抽拉速度的明显偏离和尖端半径的变化，文中对尖端开裂的演化机制进行了理论分析．
Through the in-situ observation of the sub-fast directional solidification of high purity CBr4-X alloy, the morphological evolution of dendrite to cellular crystal was demonstrated. It was found that the dendrite disappeared with tip cracking and decreased greatly with the first separation. In the process of transformation, the sharp deviation of tip growth rate from the tip speed and the change of tip radius also appeared. The evolution mechanism of tip cracking was also analyzed theoretically.