Stress in metal nanowires with twin boundaries
Work by A-Jing Cao and Yue-Guang Wei at the Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences.
The first picture is the equilibrium structure of a nanowire constructed with a fivefold twinned grain boundary running down the axis of the wire. Tensile stress is applied; the second picture shows the resulting dislocation pile-up. The third picture shows a different geometry where twin boundaries are oriented perpendicular to the axis of the nanowire. Atoms are colored according to the configuration of their neighbors; the visualization was done with the AtomEye program.
Related publications
- Formation of Fivefold Deformation Twins in Nanocrystalline Face-Centered-Cubic Copper Based on Molecular Dynamics Simulations, A. J. Cao and Y. G. Wei, Appl. Phys. Lett. 89, 041919 (2006). doi:10.1063/1.2243958
- Atomistic simulations of the mechanical behavior of fivefold twinned nanowires, A. J. Cao and Y. G. Wei, Phys. Rev. B 74, 214108 (2006). doi:10.1103/PhysRevB.74.214108
- Deformation mechanisms of face-centered-cubic metal nanowires with twin boundaries, A. J. Cao, Y. G. Wei, and S. X. Mao, Appl. Phys. Lett. 90, 151909 (2007). doi:10.1063/1.2721367