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首页> 外文期刊>Journal of Materials Science >Solidification and melting of high temperature materials: in situ observations by synchrotron radiation
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Solidification and melting of high temperature materials: in situ observations by synchrotron radiation

机译：高温材料的凝固和熔化：同步辐射的原位观察

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摘要

Until recently understanding the solidification behavior of high temperature materials, including many intermetallic systems, required evaluation of a great number of individual solidification experimental results. An additional challenge was the reactivity of metallic melts at elevated temperatures. Alternative methods for in situ observation of solidification processes using the high-energy synchrotron X-ray diffraction, which came up in the last decade, are reviewed in the present work. Here, solidifying phases and transformation sequences are directly related to their X-ray diffraction pattern, which avoids any confusion caused by subsequent phase transformations especially in complex systems. By containerless processing with aerodynamic, electrostatic and electromagnetic levitation methods, adapted to the application at the synchrotron beamline, contamination of the melt with impurities is avoided, which can corrupt the results of solidification studies by conventional methods. To date, the majority of the studies is focused on metastable phase formation and the structure of undercooled melts. Current efforts on liquid–solid phase transformations under conditions close to the equilibrium, which provide a great potential for acquisition of phase diagram data of refractory and reactive alloys, are also addressed.
机译：直到最近，了解高温材料（包括许多金属间体系）的凝固行为，才需要评估大量单独的凝固实验结果。另一个挑战是金属熔体在高温下的反应性。在本工作中，回顾了近十年来出现的使用高能同步加速器X射线衍射原位观察凝固过程的替代方法。在这里，凝固相和转变顺序与它们的X射线衍射图直接相关，这避免了后续相变引起的任何混乱，尤其是在复杂系统中。通过采用适用于同步加速器光束线的空气动力学，静电和电磁悬浮方法进行无容器处理，可避免熔体被杂质污染，这会破坏常规方法的固化研究结果。迄今为止，大多数研究集中在亚稳态相的形成和过冷熔体的结构上。还讨论了当前在接近平衡的条件下进行液相-固相​​转变的努力，这为获取耐火和反应性合金的相图数据提供了巨大的潜力。

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