Structural rejuvenation of a well-aged metallic glass  

作　　者：Yang Gao Cheng Yang Gan Ding Lan-Hong Dai Min-Qiang Jiang 

机构地区：[1]State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China [3]State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an,Shaanxi 710049,China

出　　处：《Fundamental Research》2024年第5期1266-1271,共6页自然科学基础研究（英文版）

基　　金：supported by the General Project(11972345);National Distinguished Youth Science Fund Project(12125206);Major Project(11790292)of National Natural Science Foundation of China(NSFC).

摘　　要：Rejuvenation of glassy structures in general is characterized by the exothermic enthalpy prior to the glass transition.In the present work,we find that this situation is not applicable to a heavily-aged Zr-based metallic glass that rejuvenates by anelastic deformation before yield.Instead,its rejuvenation can be precisely captured by the low-temperature boson heat capacity peak as well as the effective enthalpy change with the glass-to-liquid transition.These results demonstrate that a structurally stable glass could rejuvenate by decreasing mechanical stability of its basin of potential energy landscape,but without changing the basin's energy level.The underlying mechanism points toward the redistribution of the atomic free volume with a constant system-averaged value.We further find that the rejuvenation limit of this glass is its steady-flow state with self-similar inherent structures at both short-and long-time scales.Our findings refresh the understanding of glass rejuvenation and suggest that the boson peak is a better probe for the structural rejuvenation of glasses.

关 键 词：Metallic glasses Structural rejuvenation Calorimetric enthalpy Boson peak Steady-state flow 

分 类 号：O57[理学—粒子物理与原子核物理]