采用直径为4 mm和7 mm的试样对Al-4%Cu(质量分数,下同)合金进行定向凝固实验.研究表明:小直径试样温度梯度更高,但温度梯度变化幅度并未与试样直径比成线性比例.试样直径较小,胞/枝晶间距相应较小.获得直径为4 mm和7 mm试样一次枝晶间距与生长速率的关系,一次枝晶间距和生长速率、温度梯度的变化关系,且与理论值相符合;一次枝晶间距实验结果与TRIVEDI模型符合较好.
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