纳米压痕
无定形固体
材料科学
分子动力学
非晶态金属
复合材料
剪切矩阵
原子单位
图层(电子)
变形(气象学)
纳米尺度
剪切(地质)
纳米技术
结晶学
计算化学
合金
化学
物理
量子力学
作者
Dongpeng Hua,Wenting Ye,Qian Jia,Qing Zhou,Qiaosheng Xia,Junqin Shi,Yuyu Deng,Haifeng Wang
标识
DOI:10.1016/j.apsusc.2020.145545
摘要
The nanoindentation deformation behaviors of Cu80Zr20 (A)/Cu20Zr80 (B) amorphous/amorphous nanolaminates were studied by using molecular dynamics (MD) simulation, aiming to investigate the effects of heterogeneous interface and layer thickness on the hardness. It was found that there is a strong length-scale-dependence for the mechanical properties of amorphous/amorphous nanolaminates. There is a critical range of layer thickness h (~1 nm < h < 2 nm), within which the hardness of nanolaminates is minimized. By analyzing the shear strain and atomic displacement vector, the interface strengthening effect was found to be prominent when the layer thickness is less than 1 nm. We also revealed that the hardness of nanolaminates is mainly contributed by the surface layer when the layer thickness is larger than 1 nm, which should not be ignored when evaluating the mechanical properties at nanoscale. The current work highlights the influence of interface on the shear localized deformation through MD simulations, and shows that the amorphous/amorphous nanolaminates could be an important candidate for high performance materials at room temperature.
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