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采用单轴压缩和扫描电镜研究试样尺寸和形状因子(长径比)对 Zr56Al10.9Ni4.6Cu27.8Nb0.7 金属玻璃力学性能的影响。结果表明,小尺寸和低长径比的金属玻璃试样展现出更好的塑性,主要是小尺寸试样在凝固过程中由于更高的冷却速率而形成了大量的自由体积,以及多重剪切带的稳定传播。同时引入剪切带不稳定因子(SBI)解释了试样尺寸和高径比对金属玻璃塑性的影响。研究表明,小尺寸和低长径比的试样可以获得剪切带的稳定传播,导致金属玻璃基于尺寸和长径比的塑性演变。
Uniaxial compression and scanning electron microscopy study of sample size and shape factor (aspect ratio) on the mechanical properties of Zr56Al10.9Ni4.6Cu27.8Nb0.7 metallic glass. The results show that the small size and low aspect ratio of the metal glass samples show better plasticity, mainly due to the small size of the sample during the solidification process due to the higher cooling rate and the formation of a large number of free volume, and multiple shear Stable dissemination of the band. At the same time, the shear band instability factor (SBI) was introduced to explain the effect of sample size and aspect ratio on the plasticity of metallic glass. The results show that the stable propagation of the shear band can be obtained for the samples with small size and low aspect ratio, which leads to the plastic deformation of the metallic glass based on the size and aspect ratio.