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首页> 外文期刊>Journal of Materials Research >Recent progress in understanding high temperature dynamical properties and fragility in metallic liquids, and their connection with atomic structure
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Recent progress in understanding high temperature dynamical properties and fragility in metallic liquids, and their connection with atomic structure

机译：在理解金属液体中高温动力学特性和脆性及其与原子结构的关系方面的最新进展

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摘要

The advent of containerless processing techniques has opened the possibility of high quality measurements of equilibrium and metastable liquids. This review focuses on the structure and dynamics of metallic liquids at high temperature. A clear connection between structure, viscosity, and fragility has emerged from recent containerless experiments and molecular dynamics simulation studies. The temperature-dependent changes of liquid structures are smaller for the stronger liquids. The onset of cooperativity usually occurs above the liquidus temperature at a characteristic temperature TA, where the dynamics change from Arrhenius to non-Arrhenius behavior; this is accompanied by the onset of development of more spatially extended structural order in the liquids. Several metrics for fragility, consistent with the traditional fragility parameter, can be developed from the structural and dynamical properties at high temperature. It is becoming increasingly evident from theory and experiments that the fundamental properties that determine fragility are the repulsive part of the interatomic potential and the anharmonicity.
机译：无容器处理技术的出现为平衡和亚稳态液体的高质量测量提供了可能性。这篇综述着重于高温下金属液体的结构和动力学。最近的无容器实验和分子动力学模拟研究已经在结构，粘度和脆性之间建立了清晰的联系。对于较强的液体，取决于温度的液体结构变化较小。合作性的开始通常发生在液相线温度以上的特征温度TA处，在该温度下动力学从阿累尼乌斯行为变为非阿累尼乌斯行为。这伴随着液体中更多空间扩展结构顺序的发展。可以从高温下的结构和动力学特性中得出与传统脆性参数一致的几种脆性指标。从理论和实验变得越来越明显，决定脆性的基本特性是原子间电势和非谐性的排斥部分。

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  • 来源
    《Journal of Materials Research》 |2017年第14期|2638-2657|共20页
  • 作者

    A.K. Gangopadhyay; K.F. Kelton;

  • 作者单位

    Department of Physics and Institute of Materials Science & Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA;

    Department of Physics and Institute of Materials Science & Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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