Abstract
Scanning electron microscopy transmission Kikuchi diffraction is able to identify twins in nanocrystalline material, regardless of their crystallographic orientation. In this study, it was employed to characterize deformation twins in Cu/10 wt % Zn processed by high-pressure torsion. It was found that in 83% of grains containing twins, at least one twin intersects with a triple junction. This suggests that triple junctions could have promoted the nucleation of deformation twins. It should be cautioned that this technique might be unable to detect extremely small nanoscale twins thinner than its step size.
Highlights
The Hall–Petch relationship has inspired materials scientists to refine grains to increase the strength of materials since the early 1950s [1,2,3]
One may reasonably hypothesize that triple junctions may promote deformation twinning in nanocrystalline materials
We investigated deformation twinning in a nanostructured Cu–Zn alloy using transmission Kikuchi diffraction (TKD)
Summary
The Hall–Petch relationship has inspired materials scientists to refine grains to increase the strength of materials since the early 1950s [1,2,3]. Triple junctions have been reported to play a critical role in other deformation mechanisms in nanostructured materials, like grain rotation [16] and grain boundary sliding [17]. Earlier studies revealed that triple junctions were energetically more active than grain boundaries [18] and they were able to emit and absorb free volumes upon deformation, which promotes partial emission [12]. One may reasonably hypothesize that triple junctions may promote deformation twinning in nanocrystalline materials.
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