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首页> 外文会议>American Society of Mechanical Engineers(ASME) Summer Heat Transfer Conference(HT2005); 20050717-22; San Francisco,CA(UA) >ISOTHERMAL SOLIDIFICATION OF MICRO LAYERS OF MOLTEN ALUMINUM ALLOYS
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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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摘要

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：对铝二元合金微层的等温凝固进行了实验和理论分析。已经使用热台显微镜对反应性Al基体上熔融共晶和亚共晶Al-Si合金的行为进行了实时监测。所有测试均在高纯度氮气背景下进行。加热升温速率为20 K / min至50 K / min，峰值温度为858 K至873 K，淬火期间的冷却速率为100 K / min。硅在液/固界面上迁移的瞬态移动边界扩散模型已经得到了经验的证实。对等温凝固原因的启发式解释以及实验数据和数值预测的比较令人信服地说明，（1）固态扩散到基体中的速度很慢，以及（2）液相中扩散速度快得多，这都是控制温度的关键因素。凝固动力学。建模预测和经验数据之间的协议余量受到界面上扩散特性估计不确定性的强烈影响。在受控气氛的铝钎焊过程中，考虑到的现象对于基材的腐蚀/溶解程度至关重要。因此，它们对于通过钎焊促进产生的金属-金属键的完整性至关重要。

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