材料科学
复合材料
变形(气象学)
缩颈
极限抗拉强度
变形机理
延展性(地球科学)
压缩(物理)
纳米孔
无定形固体
多孔性
抗压强度
张力(地质)
微观结构
纳米技术
结晶学
蠕动
化学
作者
Yuhang Zhang,Jiejie Li,Yiqun Hu,Suhang Ding,Fuying Du,Re Xia
摘要
In this paper, the deformation behaviors of Cu50Zr50 bicontinuous nanoporous amorphous alloys (BNAMs) under uniaxial tension/compression are explored by molecular dynamics simulations. Scaling laws between mechanical properties and relative density are investigated. The results demonstrate that the bending deformation of the ligament is the main elastic deformation mechanism under tension. Necking and subsequent fracture of ligaments are the primary failure mechanism under tension. Under tensile loading, shear bands emerge near the plastic hinges for the BNAMs with large porosities. The typical compressive behaviors of porous structure are observed in the BNAMs with large porosities. However, for small porosity, no distinguished plateau and densification are captured under compression. The tension-compression asymmetry of modulus increases with increasing porosity, whereas the BNAMs can be seen as tension-compression symmetry of yield strength. The modulus and yield strength are negatively correlated with temperature, but a positive relationship between the tensile ductility and temperature is shown. This work will help to provide a useful understanding of the mechanical behaviors of the BNAMs.
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