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材料工程  2011 

温度梯度对定向凝固Al-4.5%Cu合金一次枝晶间距的影响

, PP. 75-79

Keywords: 温度梯度,定向凝固,Al-Cu合金,一次枝晶间距

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Abstract:

使用5kg坩埚下拉式定向凝固设备,对Al-4.5%Cu合金进行定向凝固试验,研究Al-4.5%Cu合金在不同温度梯度下一次枝晶间距的变化规律。结果表明在其他凝固参数不变时,随着温度梯度的增大,一次枝晶逐渐变小,细密,挺直,基本呈平行状分布,同时计算的一次枝晶间距值与Hunt模型计算值接近,实验测得的一次枝晶间距的回归曲线为y=2843478.3x2-70217.4x+543.8。用温度梯度较高的实验值来模拟时,可得到λ1=26.7G-0.5-135.9,一次枝晶间距λ1与G-0.5基本呈线性关系,这和Hunt模型分析结果一致。

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