精炼 Al

已经在不同的温度梯度下对精炼的 Al-20wt.%Cu 合金进行了三个系列的定向凝固实验，每个实验都应用了宽范围的冷却速率。实验在水平配置中进行，以尽量减少重力驱动现象的影响，并通过使用 X 射线照相技术进行原位和实时表征。定量分析了温度梯度对显微组织形成的影响（温度梯度区熔化的影响：TGZM）、形核距离、平均晶粒尺寸和形貌（伸长因子和晶粒取向）。实验结果与当前的理论模型和类似的实验工作进行了讨论。

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Three series of directional solidification experiments on refined Al-20wt.%Cu alloys have been carried out with different temperature gradients, and for each of them a wide range of cooling rates were applied. The experiments were performed in horizontal configuration to minimize the impact of gravity-driven phenomena and characterized in situ and in real-time by using the X-radiography technique. The influence of the temperature gradient on the microstructure formation (impact of Temperature Gradient Zone Melting: TGZM), the nucleation distance, the average grain size and morphology (elongation factor and grain orientation) have been analysed quantitatively. The experimental results are discussed with current theoretical models and similar experimental works.