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ISOTHERMAL SOLIDIFICATION OF MICRO LAYERS OF MOLTEN ALUMINUM ALLOYS

机译：熔融铝合金微层的等温凝固

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Isothermal solidification of micro layers of aluminum binary alloys has been analyzed experimentally and theoretically. An in-situ real time monitoring of the behavior of molten eutectic, and sub-eutectic Al-Si alloys on a reactive Al substrate have been conducted using the hot stage microscopy. All tests were conducted in a high purity nitrogen background atmosphere. The heating ramp rates were in the range of 20 K/min to 50 K/min, the peak temperature was in the range between 858 K and 873 K, and the cooling rate during quench was 100 K/min. A transient moving boundary diffusion model of Si transport across the liquid/solid interface has been corroborated with empirical findings. A heuristic explanation of the cause of isothermal solidification and a comparison of experimental data and numerical predictions convincingly illustrate that (1) slow solid state diffusion into the substrate and (2) a much faster diffusion within the liquid phase are both the key controlling factors of solidification kinetics. The margin of an agreement between modeling predictions and empirical data is strongly influenced by an uncertainty in the estimation of diffusion characteristics across the interface. Phenomena considered are critical for the magnitude of erosion/dissolution of substrate during controlled atmosphere aluminum brazing processes; hence they are essential for the integrity of resulting metal-metal bonds facilitated by brazing.
机译：通过实验和理论地分析了铝二元合金微层的等温凝固。使用热阶段显微镜进行了对反应性Al底物上的熔融共晶和亚共晶Al-Si合金的行为的原位实时监测。所有测试都在高纯度氮背景气氛中进行。加热斜率率在20k / min至50k / min的范围内，峰值温度在858k和873k之间的范围内，淬火期间的冷却速率为100k / min。液体/固体界面上Si输送的瞬态移动边界扩散模型已经用实证发现得到了证实。对等温凝固原因的启发式解释和实验数据的比较和数值预测令人信服地说明（1）缓慢固态扩散到基板中，（2）在液相内的更快扩散是关键控制因子凝固动力学。建模预测和经验数据之间的协议的边缘受到界面估计的不确定性的强烈影响。考虑的现象对于在受控大气钎焊过程期间基板的腐蚀/溶解的大小至关重要;因此，它们对于通过钎焊促进的金属 - 金属键的完整性至关重要。

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