Autocatalytic avalanches of unit inelastic shearing events are the mechanism of plastic deformation in amorphous silicon

被引：71

作者：

Demkowicz, MJ ^{[1
]}

Argon, AS

机构：

[1] MIT, Dept Engn Mech, Cambridge, MA 02139 USA

[2] Los Alamos Natl Lab, MST 8 Struct Property Relat, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.72.245206

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Discrete stress relaxations were found to be the source of low-temperature plastic flow in amorphous silicon (a-Si) as modeled by atomistic simulation using the Stillinger-Weber potential. These relaxations are triggered when a local yielding criterion is satisfied in a small cluster of atoms. The atomic rearrangements accompanying discrete stress relaxations are describable as autocatalytic avalanches of unit shearing events. Every such unit event centers on a clearly identifiable change in bond length between the two split peaks of the second nearest-neighbor shell in the radial distribution function of bulk a-Si in steady-state flow.

引用

页数：17

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