Department of Physics and Institute of Materials Science & Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA.
J Chem Phys. 2017 Apr 21;146(15):154506. doi: 10.1063/1.4981011.
The thermal expansion coefficients, structure factors, and viscosities of twenty-five equilibrium and supercooled metallic liquids have been measured using an electrostatic levitation (ESL) facility. The structure factor was measured at the Advanced Photon Source, Argonne, using the ESL. A clear connection between liquid fragility and structural and volumetric changes at high temperatures is established; the observed changes are larger for the more fragile liquids. It is also demonstrated that the fragility of metallic liquids is determined to a large extent by the cohesive energy and is, therefore, predictable. These results are expected to provide useful guidance in the future design of metallic glasses.
使用静电悬浮（ESL）设备测量了 25 种平衡和过冷金属液体的热膨胀系数、结构因子和粘度。在阿贡的高级光子源（Advanced Photon Source）使用 ESL 测量了结构因子。建立了液体脆性与高温下结构和体积变化之间的明确联系；对于更脆弱的液体，观察到的变化更大。还证明了金属液体的脆性在很大程度上取决于内聚能，因此是可预测的。这些结果有望为未来金属玻璃的设计提供有用的指导。
