Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7880798 | Acta Materialia | 2015 | 8 Pages |
Abstract
The plastic deformation mechanism of Cu nanowires is studied using the molecular dynamics simulation method by applying uniaxial tension along the [1Â 0Â 0] direction at a constant strain rate and constant temperature. At high strain rate and low temperature, we find a new face-centered cubic-body-centered cubic-hexagonal close-packed (fcc-bcc-hcp) phase transformation mechanism, which controls the plastic deformation of the Cu nanowire. If we raise the nanowire's temperature at a high strain rate, the plastic deformation mechanism will transform from the fcc-bcc-hcp phase transformation mechanism to the well-known momentum-induced-melting mechanism. On the other hand, if we reduce the applied strain rate to a certain level, the plastic deformation mechanism will transform into a dislocation nucleation mechanism. Based on the present study we have proposed a strain rate-temperature plastic deformation map for Cu nanowires. This map tells a vivid story about the transition among the three different plastic deformation mechanisms, and will help us develop a deep understanding of the plastic deformation of Cu nanowires.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Hongxian Xie, Fuxing Yin, Tao Yu, Guanghong Lu, Yongguang Zhang,