采用透明模型丁二腈—1.1％乙醇合金,从界面形态发展的时间相关性的角度,对平-胞转变和胞-枝转变进行了实验研究。实验结果表明,忽视界面形态发展的时间相关性,会导致过高估计平-胞转变速度和胞-枝转变速度。提出了一种确定平-胞转变条件的渐进线方法。确定了胞-枝转变速度随温度梯度变化的规律。
Directional solidification experiments have been carried out on thestudies of transitions either from planar to cellular interface or from cellular todendritic one in a transparent model alloy, succinonitrile-1.1% ethanol, with theemphasis on the time-dependent development of interface morphology. The resultsshow that paying no enough attention to the time-dependent development of inter-face morphology will lead to evident overestimate of the solidification velocities atwhich the transitions of the planar-cellular and cellular-dendritic occur. A methodof finding the critical condition of interface instability by the asymptotic line ofV vs t_c curve is given from the experimental results. The effect of temperaturegradient on the cellular-dendritic transition rate has been determined.
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