Zhao Yong, Shang Baoshuang, Zhang Bo, Tong Xing, Ke Haibo, Bai Haiyang, Wang Wei-Hua
Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China.
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Sci Adv. 2022 Aug 19;8(33):eabn3623. doi: 10.1126/sciadv.abn3623. Epub 2022 Aug 17.
Glasses have markedly different stability around their glass transition temperature (), 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 (~0.85) 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 without crystallization, which supports the idea that nucleation only occurs after the completion of enthalpy relaxation.
玻璃在其玻璃化转变温度（）附近具有明显不同的稳定性，与其他玻璃如硅酸盐玻璃或琥珀相比，金属玻璃（MGs）通常被认为是亚稳态的。在此，我们展示了在一种基于铈的金属玻璃在其（约0.85）附近进行了超过17年的老化实验。我们发现，具有强脆性的金属玻璃在长期室温老化后可转变为动力学和热力学超稳态，并表现出对结晶的强抗性。与其他金属玻璃相比，所达到的超稳态更接近理想玻璃态，与数百万年陈化的琥珀相似，这归因于其强脆性和对成核的强抗性。通过不对称接近实验还观察到，超老化的基于铈的金属玻璃在低于时可达到平衡液态而不结晶，这支持了成核仅在焓松弛完成后才发生的观点。
