Anomalous Crystallization as a Signature of the Fragile-to-Strong Transition in Metallic Glass-Forming Liquids

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• 作者：Xiunan Yang ; Chao Zhou ; Qijing Sun ; Lina Hu ; John C. Mauro ; Chunzhen Wang ; Yuanzheng Yue
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：August 28, 2014
• 年：2014
• 卷：118
• 期：34
• 页码：10258-10265
• 全文大小：464K
• ISSN：1520-5207

文摘

We study the fragile-to-strong (F鈥揝) transition of metallic glass-forming liquids (MGFLs) by measuring the thermal response during annealing and dynamic heating of La₅₅Al₂₅Ni₅Cu₁₅ glass ribbons fabricated at different cooling rates. We find that the glasses fabricated in the intermediate regime of cooling rates (15鈥?5 m/s) exhibit an anomalous crystallization behavior upon reheating as compared to the glasses formed at other cooling rates. This anomalous crystallization behavior implies the existence of a thermodynamic F鈥揝 transition, could be used as an alternative method for detecting the F鈥揝 transition in MGFLs, and sheds light on the structure origin of the F鈥揝 transition. This work also contributes to obtaining a general thermodynamic picture of the F鈥揝 transition in supercooled liquids.