Ding G, Li C, Zaccone A, Wang W H, Lei H C, Jiang F, Ling Z, Jiang M Q
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China.
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
Sci Adv. 2019 Aug 23;5(8):eaaw6249. doi: 10.1126/sciadv.aaw6249. eCollection 2019 Aug.
Structural rejuvenation of glasses not only provides fundamental insights into their complicated dynamics but also extends their practical applications. However, it is formidably challenging to rejuvenate a glass on very short time scales. Here, we present the first experimental evidence that a specially designed shock compression technique can rapidly rejuvenate metallic glasses to extremely high-enthalpy states within a very short time scale of about 365 ± 8 ns. By controlling the shock stress amplitude, the shock-induced rejuvenation is successfully frozen at different degrees. The underlying structural disordering is quantitatively characterized by the anomalous boson heat capacity peak of glasses. A Deborah number, defined as a competition of time scales between the net structural disordering and the applied loading, is introduced to explain the observed ultrafast rejuvenation phenomena of metallic glasses.
玻璃的结构恢复活力不仅能为其复杂动力学提供基本见解，还能拓展其实际应用。然而，在极短时间尺度上使玻璃恢复活力极具挑战性。在此，我们展示了首个实验证据，即一种专门设计的冲击压缩技术能够在约365±8纳秒的极短时间尺度内将金属玻璃迅速恢复到极高焓状态。通过控制冲击应力幅度，冲击诱导的恢复活力成功地在不同程度上被冻结。潜在的结构无序通过玻璃的反常玻色子热容量峰值进行定量表征。引入一个德博拉数，定义为净结构无序与外加负载之间时间尺度的竞争，以解释所观察到的金属玻璃超快恢复活力现象。
