脆弱性
成核
亚稳态
结晶
玻璃化转变
热力学
材料科学
放松(心理学)
非晶态金属
焓
过冷
化学
冶金
复合材料
聚合物
合金
有机化学
物理
社会心理学
心理学
作者
Yong Zhao,Baoshuang Shang,Bo Zhang,Xing Tong,Haibo Ke,H. Y. Bai,Weihua Wang
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2022-08-17
卷期号:8 (33)
被引量:37
标识
DOI:10.1126/sciadv.abn3623
摘要
Glasses have markedly different stability around their glass transition temperature (Tg), and metallic glasses (MGs) are conventionally regarded as metastable compared to other glasses such as silicate glass or amber. Here, we show an aging experiment on a Ce-based MG around its Tg (~0.85Tg) for more than 17 years. We find that the MG with strong fragility could transform into kinetic and thermodynamic hyperstable state after the long-term room temperature aging and exhibits strong resistance against crystallization. The achieved hyperstable state is closer to the ideal glass state compared with that of other MGs and similar to that of the million-year-aged amber, which is attributed to its strong fragility and strong resistance against nucleation. It is also observed through the asymmetrical approaching experiment that the hyperaged Ce-based MG can reach equilibrium liquid state below Tg without crystallization, which supports the idea that nucleation only occurs after the completion of enthalpy relaxation.
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