Experimental and computational approaches for the understanding of the nature of deformation band formed in materials with hexagonal crystal structures

Abstract

Formation of curious deformation bands has been reported as one of the deformation mechanisms occurring in a Mg-based long period stacking ordered (LPSO) phase. The origin of the deformation band is still unknown, and the possibility of the deformation kink band and/or the deformation twin has been discussed. To clarify this, in this study the crystallographic nature of deformation bands formed in the hcp-Zn was first examined in details both by the experimental and computational approaches. And the obtained results were compared to those observed in LPSO phase. As a result, it was found that deformation bands formed in them showed many similar features, such as an ambiguous crystal rotation axis that varied on the [0001] zone axis from band to band, an arbitral crystal rotation angle that was not fixed etc. This suggests that the developing feature of the deformation bands in LPSO phase crystals can be explained by the "deformation kink band formation model".