2017/06/07 by Mingyu Gong, J. P. Hirth, Yue Liu +2 · 3 citations
Materials Science · #Magnesium Alloys: Properties and Applications #Quasicrystal Structures and Properties #Microstructure and mechanical properties #Crystal twinning #Materials science #Hexagonal crystal system #Interface (matter) #Crystallography #Metallurgy #Microstructure #Composite material
paper · doi:10.1080/21663831.2017.1336496
openalex publication_date 2017/06/07 · openalex created_date 2017/06/15 · openalex updated_date 2026/07/29
A controversy concerning the description of twinning, whether it is shear-shuffle or pure glide-shuffle or pure shuffle, has developed. There is disagreement about the interpretation of transmission electron microscopic observations, atomistic simulations and theories for twin growth. In this article, we highlight the atomic-level, characteristic, equilibrium and non-equilibrium boundaries and corresponding boundary defects associated with the three-dimensional ‘normal’, ‘forward’ and ‘lateral’ propagation of growth/annealing and deformation twins. Although deformation twin boundaries (TBs) after recovery exhibit some similarity to growth/annealing TBs because of the plastic accommodation of stress fields, there are important distinctions among them. These distinctions distinguish among the mechanisms of twin growth and resolve the controversy. In addition, a new type of disconnection, a glide disclination, is described for twinning. Synchroshear, seldom considered, is shown to be a likely mechanism for twinning.