Shear band behaviour plays a critical role in toughening and failure of bulk metallic glasses (BMGs). However, due to instability in time and inhomogeneity in space, spatial–temporal evolutions of shear bands are difficult to be studied in the past decades. Using digital image correlation (DIC) and infrared thermal imaging (ITI) technologies, uniaxial quasi-static compressions for Zr_41.2Ti_13.8Ni₁₀Cu_12.5Be_22.5 BMG are carried out. The spatial–temporal evolutions of shear bands, as well as the relationship between shear band and failure in BMGs, are in-situ investigated. A theoretical evaluation of temperature is performed based on the heat conduction theory, in line with the experimental data. Moreover, a free volume theory-based amorphous viscoplasticity model is implemented by finite element method (FEM) to understand the shear band behaviour further. The nucleation, propagation, intersection of shear bands are investigated in detail, and the simulation results are in agreement with the experiments in some respects. Besides, it is found that the primary shear band tends to be activated more easily along a so-called dominant path generated after shear-band competitions. This paper provides insights for the prediction of the primary shear band, prevention of failure, and toughening method in BMGs.

剪切带行为在块状金属玻璃（BMG）的增韧和破坏中起着至关重要的作用。但是，由于时间的不稳定性和空间的不均匀性，过去几十年来很难研究剪切带的时空演化。使用数字图像相关（DIC）和红外热成像（ITI）技术，对Zr _41.2 Ti _13.8 Ni ₁₀ Cu _12.5 Be _22.5 BMG进行了单轴准静态压缩。剪切带的时空演化以及BMG剪切带与破坏之间的关系是原位的调查。根据热传导理论，根据实验数据对温度进行理论评估。此外，通过有限元方法（FEM）建立了基于自由体积理论的非晶粘塑性模型，以进一步了解剪切带的行为。详细研究了剪切带的形核，传播，相交，其模拟结果在某些方面与实验吻合。此外，已经发现，主剪切带倾向于沿着剪切带竞争之后产生的所谓的主导路径更容易被激活。本文为BMG的主剪切带的预测，破坏的预防和增韧方法提供了见识。