Electron backscattered diffraction scan of a deformed Re-W alloy with abundant twinning. Black areas represent surface pitting. [Maarten de Jong et al., Phys. Rev. Lett. 115, 065501 (2015)]

From the article:

Electronic Origins of Anomalous Twin Boundary Energies in Hexagonal Close Packed Transition Metals
Maarten de Jong, J. Kacher, M. H. F. Sluiter, L. Qi, D. L. Olmsted, A. van de Walle, J. W. Morris, Jr., A. M. Minor, and M. Asta
Phys. Rev. Lett. 115, 065501 (2015)

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