采用Al-4%Cu合金,对不同抽拉速率下定向凝固枝晶界面特征进行了研究.结果表明,当抽拉速率从100 μm/s增至600μm/s时,一次枝晶间距随抽拉速率的增大而减小.在枝晶固/液界面存在枝晶干的凸起,其平-凸-平-凸的程度随抽拉速率的增加呈现先加强后减弱最后几乎消失的规律.随着抽拉速率的增大,枝晶尖端温度先升高而后降低.采用KGT模型和非平衡效应研究了枝晶界面温度,分析了尖端过冷度和尖端成分对枝晶界面特征的影响,得到非平衡凝固枝晶尖端过冷度的计算方程.界面平-凸-平-凸的程度与枝晶尖端成分和尖端过冷度有关.
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