The design of ductile heterogeneous metallic glasses (MGs) with enhanced deformability by purposely controlling the shear-band dynamics via modulation of the atomic-scale structures and local stress states remains a significant challenge. Here, we correlate the changes in the local atomic structure when cooling to cryogenic temperature with the observed improved shear stability. The enhanced atomic-level structural and elastic heterogeneities related to the nonaffine thermal contraction of the short-range order (SRO) and medium-range order (MRO) change the characteristics of the activation process of the shear transformation zones (STZs). The experimental observations corroborated by Eshelby inclusion analysis and molecular dynamics simulations disclose the correlation between the structural fluctuations and the change in the stress field around the STZ. The variations in the inclination axes of the STZs alter their percolation mechanism, affect the shear-band dynamics and kinetics, and consequently delay shear failure. These results expand the understanding of the correlation between the atomic-level structure and elementary plastic events in monolithic MGs and thereby pave the way for the design of new ductile metallic alloys.

通过通过调节原子尺度结构和局部应力状态有目的地控制剪切带动力学来设计具有增强的可变形性的延展性非均质金属玻璃（MGs）仍然是一个重大挑战。在这里，我们将冷却到低温时的局部原子结构变化与观察到的改善的剪切稳定性相关联。与短程量级（SRO）和中程量级（MRO）的非仿射热收缩有关的增强的原子级结构和弹性异质性改变了剪切转变区（STZs）活化过程的特征。Eshelby夹杂物分析和分子动力学模拟证实的实验观察揭示了结构波动与STZ周围应力场变化之间的相关性。STZ倾斜轴的变化会改变其渗透机理，影响剪切带的动力学和动力学，从而延迟剪切破坏。这些结果扩大了对整体式MG中原子能级结构与基本塑性事件之间相关性的理解，从而为新型延展性金属合金的设计铺平了道路。