CAJ | 학술논문

研究网络结构对Zr?Al?Ni?Cu块体金属玻璃的塑性和断裂模式的影响。采用化学腐蚀法显示并用SEM观察横截面和纵截面的微观结构，采用室温单向压缩试验测定力学性能。结果表明，网络结构显著地影响Zr?Al?Ni?Cu块体金属的塑性和断裂模式，当网络结构的尺寸达到某一临界值时，塑性和断裂模式发生转变。当胞状结构的尺寸约为3μm时，Zr基块体金属玻璃表现出塑性，并且塑性随胞状尺寸的增加而降低。断裂模式随胞状尺寸的增加逐渐由单一45°剪切面断裂向双45°剪切面断裂，最后转变为劈裂断裂。另外，探讨这些Zr基块体金属玻璃的塑性和断裂模式发生改变的机理。
연구망락결구대Zr?Al?Ni?Cu괴체금속파리적소성화단렬모식적영향。채용화학부식법현시병용SEM관찰횡절면화종절면적미관결구，채용실온단향압축시험측정역학성능。결과표명，망락결구현저지영향Zr?Al?Ni?Cu괴체금속적소성화단렬모식，당망락결구적척촌체도모일림계치시，소성화단렬모식발생전변。당포상결구적척촌약위3μm시，Zr기괴체금속파리표현출소성，병차소성수포상척촌적증가이강저。단렬모식수포상척촌적증가축점유단일45°전절면단렬향쌍45°전절면단렬，최후전변위벽렬단렬。령외，탐토저사Zr기괴체금속파리적소성화단렬모식발생개변적궤리。
Effect of network structure on plasticity and fracture mode of Zr?Al?Ni?Cu bulk metallic glasses (BMGs) was investigated. The microstructures of transversal and longitudinal sections were exposed by chemical etching and observed by scanning electron microscopy (SEM). The mechanical properties were examined by room-temperature uniaxial compression test. The results show that both plasticity and fracture mode are significantly affected by the network structure and the alteration occurs when the size of the network structure reaches up to a critical value. When the cell size (dc) of the network structure is ~3μm, Zr-based BMGs characterize in plasticity that decreases with increasingdc. The fracture mode gradually transforms from single 45° shear fracture to double 45° shear fracture and then cleavage fracture with increasingdc. In addition, the mechanisms of the transition of the plasticity and the fracture mode for these Zr-based BMGs are also discussed.