Autocatalytic avalanches of unit inelastic shearing events are the mechanism of plastic deformation in amorphous silicon
Autocatalytic avalanches of unit inelastic shearing events are the mechanism of plastic deformation in amorphous silicon
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DOI：
10.1103/physrevb.72.245206
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发表时间：
2005-12-01
影响因子：
3.7
通讯作者：
Argon, AS
中科院分区：
文献类型：
--
作者：
Demkowicz, MJ;Argon, AS
采用Stillinger-Weber势进行原子模拟，发现离散应力弛豫是非晶硅（a-Si）低温塑性流动的来源。当一个小的原子团簇满足局部屈服准则时，这些弛豫被触发。原子重排伴随着离散应力松弛被描述为单位剪切事件的自催化雪崩。每一个这样的单位事件中心的第二个最近的邻居壳的径向分布函数中的散装a-Si在稳态流的两个分裂峰之间的键长的一个明确可识别的变化。
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.