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arXiv 2311.04422cond-mat.mtrl-scicond-mat.dis-nn
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低温复壮导致 Gd-Co 金属玻璃的结构与动力学变化

Structural and Dynamical Changes in a Gd-Co Metallic Glass by Cryogenic Rejuvenation

Shinya Hosokawa, Jens R. Stellhorn, Laszlo Pusztai, Yoshikatsu Yamazaki, Jing Jiang, Hidemi Kato, Tetsu Ichitsubo, Eisuke Magome, Nils Blanc, Nathalie Boudet, K… 展开作者

Shinya Hosokawa, Jens R. Stellhorn, Laszlo Pusztai, Yoshikatsu Yamazaki, Jing Jiang, Hidemi Kato, Tetsu Ichitsubo, Eisuke Magome, Nils Blanc, Nathalie Boudet, Koji Ohara, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q. R. Baron

AI总结:

该研究结合 HEXRD、AXS 与 IXS,揭示 Gd65Co35 金属玻璃经 40 次液氮—室温循环后,Gd 原子纳米尺度浓度及弹性非均匀性增强。

摘要:

为了通过实验阐明金属玻璃(MG)Gd65Co35 在温度循环(低温复壮)复壮作用下结构和动力学非均匀性的变化,研究人员开展了高能 X 射线衍射(HEXRD)、反常 X 射线散射(AXS)和非弹性 X 射线散射(IXS)实验。通过在液氮温度与室温之间重复进行 40 次温度变化,HEXRD 观察到即使在第一近邻范围内也出现了微小但清晰的结构变化。AXS 获得的部分结构信息表明,在以 Gd 原子为中心的第一和第二近邻壳层中,Gd 和 Co 原子发生了轻微移动。温度循环使 Gd 原子在纳米尺度上的浓度非均匀性显著增加,而其他非均匀性则可忽略不计。IXS 检测到微观弹性质发生明显变化:纵声学激发的宽度展宽约 20%,表明该热处理增加了这种金属玻璃的弹性非均匀性。这些静态和动态结果从实验上明确阐明了低温复壮效应的特征。

英文摘要:

To experimentally clarify the changes in structural and dynamic heterogeneities in a metallic glass (MG), Gd65Co35, by rejuvenation with a temperature cycling (cryogenic rejuvenation), high-energy x-ray diffraction (HEXRD), anomalous x-ray scattering (AXS), and inelastic x-ray scattering (IXS) experiments were carried out. By a repeated temperature change between liquid N2 and room temperatures 40 times, tiny but clear structural changes are observed by HEXRD even in the first neighboring range. Partial structural information obtained by AXS reveals that slight movements of the Gd and Co atoms occur in the first- and second-neighboring shells around the central Gd atom. The concentration inhomogeneity in the nm size drastically increases for the Gd atoms by the temperature cycling, while the other heterogeneities are negligible. A distinct change was detected in a microscopic elastic property by IXS: The width of longitudinal acoustic excitation broadens by about 20%, indicating an increase of the elastic heterogeneity of this MG by the thermal treatments. These static and dynamic results explicitly clarify the features of the cryogenic rejuvenation effect experimentally.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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