The influence mechanism of the strain rate on the tensile behavior of copper nanowire

• 来源期刊: 中国科学:技术科学（英文版）
• 年，卷（期）: 2019,（11）
• 页码范围: 2014-2020
• 页数: 7页
• 语种: 英文

摘要

The influence mechanism of the strain rate on the tensile behavior of the copper nanowires is investigated with molecular dynamics (MD) simulations.Three failure modes are observed at the loading strain rates from 5×106 to 1×109 s-1.The three modes are named slipping mode,mixed mode and necking mode,respectively.The evolution of atomic configurations show that the competition of the lattice recovery and the dislocation multiplication determines the fracture mode,and the importance of lattice recovery decreases with the increase of strain rate.The input and the reflection of the tensile wave,which is induced by tensile loading,also plays an important role in the failure mechanism.The location of necking tends to approach the two ends of nanowire at higher strain rates.