Transition of dislocation nucleation induced by local stress concentration in nanotwinned copper

N. Lu, K. Du (), L. Lu and H. Q. Ye
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N. Lu: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
K. Du: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
L. Lu: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
H. Q. Ye: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Metals with a high density of nanometre-scale twins have demonstrated simultaneous high strength and good ductility, attributed to the interaction between lattice dislocations and twin boundaries. Maximum strength was observed at a critical twin lamella spacing (∼15 nm) by mechanical testing; hence, an explanation of how twin lamella spacing influences dislocation behaviours is desired. Here, we report a transition of dislocation nucleation from steps on the twin boundaries to twin boundary/grain boundary junctions at a critical twin lamella spacing (12–37 nm), observed with in situ transmission electron microscopy. The local stress concentrations vary significantly with twin lamella spacing, thus resulting in a critical twin lamella spacing (∼18 nm) for the transition of dislocation nucleation. This agrees quantitatively with the mechanical test. These results demonstrate that by quantitatively analysing local stress concentrations, a direct relationship can be resolved between the microscopic dislocation activities and macroscopic mechanical properties of nanotwinned metals.

Date: 2015
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DOI: 10.1038/ncomms8648

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