利用ISS-EML设施在国际空间站上进行的实验证明搅拌对成核的影响
Demonstration of the effect of stirring on nucleation from experiments on the International Space Station using the ISS-EML facility
摘要：
流体流动对过冷液体中晶体成核的影响还没有很好的理解。液体中的密度和温度梯度的变化使得在地球重力条件下很难对其进行研究。因此，在微重力环境下，利用国际空间站上的电磁悬浮设施，对大块玻璃形成的Zr 57 Cu 15.4 Ni 12.6 Al 10 Nb 5（Vit106）以及Cu 50 Zr 50和准晶形成的Ti 39.5 Zr 39.5 Ni 21液体进行了成核实验。通过向水冷铜线圈施加射频定位器和加热器电压的各种组合，测量每种合金的最大过冷温度，作为受控搅拌的函数。根据已知的线圈和悬浮样品的参数，模拟了流型。对于Vit106，最大成核温度随着液体中流体流量的增加而系统地增加，但对于其他两种保持几乎不变。这些结果与核化的耦合通量模型的预测是一致的。
英文摘要：
The effect of fluid flow on crystal nucleation in supercooled liquids is not well understood. The variable density and temperature gradients in the liquid make it difficult to study this under terrestrial gravity conditions. Nucleation experiments were therefore made in a microgravity environment using the Electromagnetic Levitation facility on the International Space Station on a bulk glass-forming Zr57Cu15.4Ni12.6Al10Nb5 (Vit106), as well as Cu50Zr50 and the quasicrystal-forming Ti39.5Zr39.5Ni21 liquids. The maximum supercooling temperatures for each alloy were measured as a function of controlled stirring by applying various combinations of radio frequency positioner and heater voltages to the water-cooled copper coils. The flow patterns were simulated from the known parameters for the coil and the levitated samples. The maximum nucleation temperatures increased systematically with increased fluid flow in the liquids for Vit106, but stayed nearly unchanged for the other two. These results are consistent with the predictions from the coupled-flux model for nucleation.
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