Abstract
An as-cast Mg94Zn2Y4 alloy has been subjected to compression and equal channel angular pressing separately; the resultant microstructure was characterised using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and transmission Kikuchi diffraction (TKD). The as-cast Mg94Zn2Y4 alloy contains a long-period stacking ordered (LPSO) phase and a Mg24Y5 phase. After the compression, kink boundaries are observed in the LPSO phase and are composed of straight basal ⟨a⟩ dislocations. The dislocation arrangement in the kink boundaries of the LPSO/Mg mixture (alternate thin layers of LPSO and Mg) is similar to that in the LPSO phase. The rotation axes of the kink boundaries in LPSO/Mg are preferentially located in the (0001) plane, though [0001] rotation axis has occasionally been observed. Double kinking and non-basal slip have also been observed in the LPSO/Mg mixture. Dynamically recrystallised Mg grains are observed in the kink boundaries located within the LPSO/Mg mixture, preferentially in the kink boundaries with high misorientation angles. The kink boundary acts as the nucleation site for dynamic recrystallisation due to the high energy stored.
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