Size-independent shear band formation in amorphous nanowires made from simulated casting
Size-independent shear band formation in amorphous nanowires made from simulated casting
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DOI：
10.1063/1.3340908
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发表时间：
2010-03-22
影响因子：
4
通讯作者：
Shi, Yunfeng
中科院分区：
文献类型：
--
作者：
Shi, Yunfeng
分子动力学模拟表明，表面强烈影响非晶纳米线在拉伸应变局部化行为。采用模拟铸造的样品制备程序以促进样品表面的松弛。短至15 nm（直径7.5 nm）的样品在变形过程中形成占主导地位的剪切带。在塑性变形过程中的弹性能量释放是足够的，以提供所需的剪切带成核在相当小的样品尺寸的多余的势能。结果表明，剪切带的形成几乎与尺寸无关，只受其自身长度尺度的限制。
Molecular dynamics simulations indicate that surfaces strongly influence the strain localization behavior of amorphous nanowires in tension. A sample preparation routine that simulates casting was employed to facilitate the relaxation of the sample surface. Samples as short as 15 nm (7.5 nm in diameter) form dominant shear bands during deformation. The elastic energy release during plastic deformation is sufficient to provide the excess potential energy required for the shear band nucleation at rather small sample sizes. The results show that shear band formation is almost size-independent and is bounded only by its own length scale.