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“Unconventional twins” were reported by Cayron and Logé  to form in plastically deformed magnesium. They were used to show the occurrence of a new twinning mode which was used to argue for reconsidering the theory of deformation twinning that is based on simple shear , and to support a concept of axial weak twins . Our paper demonstrates the incorrect interpretation of their electron back-scatter diffraction map in , and that the so-called “unconventional” twins are just conventional extension twins that have impinged with each other. Therefore, the so-called habit plane of the “unconventional twins” is a boundary resulting from impingement of these two different variants of the extension twin, and is therefore not expected to be invariant.
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