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中文摘要：
为了揭示自由落体条件下偏晶合金壳核组织的形成机制,基于相似性原理设计了一种环形温度场,对丁二腈-52.6mol%H2O偏晶溶液的相分离过程进行了实时观测.发现在两个不混溶液相的分离过程中,富水相液滴经历了“析出→迁移→凝并→聚集”运动过程,最终形成以富水相为中心的两层壳核组织.同时测定了液滴的运动速率,并对Marangoni迁移速率进行了理论计算,两者能够较好地符合.由此证实了在偏晶溶液的相分离过程中,第二液相主要是在温度梯度的驱动下产生Marangoni迁移.这一实验直观地再现了落管无容器处理过程中液滴内部的相分离过程.
英文摘要：
A horizontal annular temperature field has been designed on the basis of similarity principle to investigate the formation mechanism of core-shell microstructures of monotectic alloys during free fall. The phase separation process of transparent succinodinitrile-52.6mo1% H2O monotectic solution was observed directly. The H2 0 phase separated from the parent liquid at first, then moved to the center of the sample, and at last occupied the core part. The moving velocities of H2O droplets were measured according to the photographic pictures, which are in good agreement with the theoretical prediction of Marangoni migration velocities. The experiment reproduced the liquid phase separation process of monotectic alloy under microgravity condition.
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