Size-dependent torsional deformation of silicon nanowires

作者：Zhuo, Xiao Ru; Beom, Hyeon Gyu^*

来源：Materials Letters, 2018, 213: 48-50.

DOI：10.1016/j.matlet.2017.11.011

• Molecular dynamics simulation
• Silicon nanowires
• Torsional deformation
• Plastic deformation
• Size effect

The effect of size on the torsional deformation of [1 1 0]-oriented silicon nanowires is examined via molecular dynamics simulations. The plastic deformation mechanism of silicon nanowires depends on the nanowire diameter. Sub-5.7-nm-diameter silicon nanowires yield by means of a crystal-to-amorphous transition, which nucleates at the outer surface and propagates along the cross-section of the wires. On the other hand, perfect dislocations nucleate at the outer surface of wires whose diameter equals or exceeds 7.7 nm, initiating plastic deformation. These dislocations have a Burgers vector of 1/2 < 110 > and slip along the {1 1 1} planes. These findings may enhance our understanding of plasticity of silicon nanowires.

• 出版日期2018-2-15
• 单位河海大学