High-density liquidlike component facilitates plastic flow in a model amorphous silicon system

被引:95
作者
Demkowicz, MJ [1 ]
Argon, AS [1 ]
机构
[1] MIT, Cambridge, MA 02139 USA
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevLett.93.025505
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Molecular dynamics simulations show that plastic deformation of amorphous Si modeled by the Stillinger-Weber potential is very sensitive to the density of the initial unstressed state. Low-density systems exhibit a pronounced yield phenomenon, strain softening, and a dramatic drop in pressure during deformation at a constant volume. This behavior is explained by the presence in every system of a certain concentration of solidlike and liquidlike components, the latter being denser and more amenable to plastic flow.
引用
收藏
页码:025505 / 1
页数:4
相关论文
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