中文摘要：

研究了Vit1块体金属玻璃在不同压缩载荷下的塑性变形行为和对应的剪切带斑图演化规律.基于机械约束模型,采用高分辨透射电子显微镜对约束载荷下金属玻璃剪切带斑图的形成及演化规律和压缩塑性形成机制进行了分析.结果表明,压缩裁荷下机械约束是多重剪切带形成的诱因,纳米晶粒的形成进一步增强了多重剪切带的形成,进而增强金属玻璃的压缩塑性变形能力,对理解块体金属玻璃在约束裁荷下剪切带斑图的演化规律、塑性变形行为和进行压力加工提供了有价值的参考.

英文摘要：

The compression deformation behaviors and the corresponding shear band pattern of Vit1 bulk metallic glass （BMG） under different load levels were investigated.The shear band pattern formation and evolution and the origin of the compression plasticity of Vit1 BMG were explored based on the mechanical constraint model and the observation of the shear band region using high resolution transmission electron microscope.The results demonstrate that both mechanical constraint and nanocrystalline formation affect the multiple shear band formation,evolution and the compression plasticity of BMG.It is helpful to understand the shear band pattern evolution,plastic deformation behaviors and pressure processing under constraint load.