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对一种锆基大块金属玻璃材料进行了室温下的准静态SEM“原位”压缩实验,并对其剪切带行为进行了研究.测得的宏观应力应变曲线表现出理想弹塑性响应.对样品变形过程中和断裂后的表面剪切带斑图进行的分析表明,多重剪切带的形成及其交割和分叉行为能显著提升其金属玻璃材料的塑性变形能力.采用Mohr-Coulomb模型对其断裂偏离最大剪应力平面的现象进行了描述.基于金属玻璃塑性变形的自由体积模型,对剪切带交割点产生的纳米尺度空洞和微裂纹形成机理进行了分析.图6,参16.
A quasi-static SEM “in-situ ” compression experiment was carried out at room temperature on a zirconium-based bulk metallic glass material and its shear band behavior was studied. The measured macro-stress-strain curve showed ideal elasto-plasticity Response Analysis of the surface shear banding patterns during and after fracture shows that the formation of multiple shear bands and their delivery and bifurcation behavior can significantly enhance the plastic deformation ability of the metallic glass materials.The Mohr- Coulomb model is used to describe the phenomenon that the fracture deviates from the plane of the maximum shear stress.According to the free-volume model of the plastic deformation of metal glass, the formation mechanisms of nanoscale voids and microcracks at the delivery point of the shear band are analyzed. 16.