The mechanical behaviors of Zr_43.5Cu_43.5Ni₄Al₈Nb₁, Zr_55.4Cu_31.6Ni₄Al₈Nb₁, Ti_32.8Zr_30.2Ni_5.3Cu₉Be_22.7 (at.%) metallic glass at different strain rates were studied. For all the present alloys, the dispersion over 700 MPa was observed on the strength in the repeated dynamic compressions, which was much stronger than that of the quasi-static compressive strength. Such the dispersion of the dynamic compressive strength was well correlated with the corresponding fracture behaviors. The area of fracture surface was calculated and also showed a strong dispersion for all the fractured specimens tested at the strain rate of 500 s⁻¹ and 1000 s⁻¹. All the specimens showed a linear relationship between the square of dynamic compressive strength and the area of fracture surface in the dynamic compression tests. This phenomenon was mainly thought to be related to the difference of mean initial free volume concentration of different samples, stress concentration caused by the split Hopkinson pressure bar experimental setup and high sensitivity of defects under dynamic deformation. These findings were beneficial to deeply understand the effect of strain rate on the mechanical properties of the metallic glass.

中文翻译：

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大块金属玻璃动态抗压强度与断裂行为的相关性

Zr _43.5 Cu _43.5 Ni ₄ Al ₈ Nb ₁，Zr _55.4 Cu _31.6 Ni ₄ Al ₈ Nb ₁，Ti _32.8 Zr _30.2 Ni _5.3 Cu ₉ Be _22.7的力学行为研究了不同应变速率下的（at。％）金属玻璃。对于所有当前合金，在重复动态压缩中的强度上观察到超过700 MPa的分散，这比准静态压缩强度要强得多。动态抗压强度的这种分散与相应的断裂行为密切相关。计算出了在500 s ^-1和1000 s ^-1的应变速率下测试的所有断裂试样的断裂表面面积，并显示出很强的分散性。在动态压缩试验中，所有试样均显示出动态抗压强度的平方与断裂表面面积之间的线性关系。这种现象主要被认为与不同样品的平均初始自由体积浓度的差异，由霍普金森压力棒实验装置分裂引起的应力集中以及动态变形下缺陷的高敏感性有关。这些发现有助于深入了解应变速率对金属玻璃机械性能的影响。