Activation of pyramidal II <c+a> slips at room temperature in Mg-Zn-Y 18R and 14H long-period stacking ordered phases

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Original languageEnglish
Article number107225
Journal / PublicationIntermetallics
Online published11 May 2021
Publication statusPublished - Aug 2021


The 18R and 14H long-period stacking ordered (LPSO) phases were generally considered that only the basal and non-basal <a>slips and kink banding could be activated during quasi-state deformation at room temperature. Here, we confirm that the pyramidal II <c+a> slips can also be activated in the 18R LPSO phase by quasi-state nanoindentation and in the 14H LPSO phase by cold roll with a rolling direction parallel to the (0001) plane. Due to the interaction between the Zn6Y8 atomic clusters in the LPSO phases and the pyramidal II <c+a> dislocations, the pyramidal II slips are localized in the well-defined slip bands while the chemically ordered structure of Zn6Y8 atomic clusters is disrupted to be disordered. Additionally, the interaction also induces Zn/Y atoms segregation at the two edges of the slip band. Our results unravel the origin for the excellent room temperature plasticity in the LPSO phases.

Research Area(s)

  • Mg alloy, Intermetallics, Long-period stacking ordered phase, Deformation microstructure, Pyramidal II <c+a> slip, Electron microscopy