金属玻璃均匀变形研究进展

Research Progress on Homogeneous Deformation of Metallic Glasses

摘要:

金属玻璃性能优异，但在室温以剪切带形式脆性断裂。均匀变形对于理解金属玻璃的塑性至关重要。本文综述了近年来金属玻璃均匀变形行为的研究进展，重点从原子尺度流动机制、剪切转变区演化、结构缺陷与多层次弛豫行为等方面展开讨论，并介绍了自由体积动力学、应力-温度等效性及无序化临界应力等关键概念。讨论了结构非均匀性对流动稳定性的影响，评述了现代表征与模拟技术的应用，并在此基础上展望了设计高塑性金属玻璃的研究路径。

Abstract:

Metallic glasses exhibit exceptional properties but suffer from brittle fracture via shear banding at room temperature. Homogeneous deformation is vital for understanding amorphous plasticity. This review summarized recent advances in homogeneous deformation of metallic glasses in atomic-scale flow mechanisms, evolution of shear transformation zones, flow defects, and hierarchical relaxation processes. The correlation among free volume kinetics, stress-temperature equivalence, and rejuvenation threshold stress was introduced. Role of structural heterogeneity in flow stability was discussed, alongside the application of modern characterization and modeling techniques. The review proposed investigation methods for designing high ductile metallic glasses based on these insights.