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Dynamic Fracture Morphology of Bulk Metallic Glass Subjected to Shock Compression

机译：冲击压缩作用下大块金属玻璃的动态断裂形态

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Micrographs of samples impacted with tungsten at increasing velocities show that the deformation becomes increasingly inhomogeneous with strain-rate, suggesting a dependence of fracture mechanisms and morphology on strain-rate. There also seems to be an increased level of melting, suggesting that there is a greater release of fracture energy resulting in higher temperatures, with each subsequent velocity, as seen from increasing amounts of resolidified particles and melted belts. Micrographs of samples impacted at 62 m/s with different flyer materials, resulting in varying shock amplitudes, shows that with increasing amplitude, the extent of damage from compression results in the nature of deformation transitioning from ductile to brittle. This indicates that different damage mechanisms govern fracture at varying levels of loading stress. These findings are in accordance with those of Zhuang et al. Further investigations of BMG behavior over a wider range of strain rates and shock amplitude will lead to an even more enhanced understanding of mechanisms of fracture and shear band formation.
机译：钨以增加的速度冲击的样品的显微照片显示，变形随应变率变得越来越不均匀，表明断裂机理和形貌对应变率的依赖性。从重新固化的颗粒和熔化的带数量的增加可以看出，熔融程度似乎也有所提高，这表明断裂能的释放更大，从而导致温度升高，随之而来的是每个随后的速度。受到不同飞行物材料以62 m / s冲击的样品的显微照片，导致了不同的冲击振幅，表明随着振幅的增加，压缩造成的破坏程度导致变形的性质从韧性转变为脆性。这表明在不同的加载应力水平下，不同的损伤机制控制着断裂。这些发现与庄等人的发现是一致的。在更大的应变率和冲击振幅范围内对BMG行为的进一步研究将使人们更加了解断裂和剪切带形成的机理。

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