Hot compression deformation behavior of Mg-9Gd-2.9Y-1.9Zn-0.4Zr-0.2Ca (wt%) alloy

Microstructure and Texture Evolution of Mg–Gd–Y–Zn–Zr Alloy by Compression–Torsion Deformation

“…The DRX mechanism at a strain rate of 0.1 s −1 was studied from G2, as shown in Figure 5b. It can be clearly seen that the deformation mechanism of DRX under this strain rate condition is still CDRX [10]. It can be seen from Figure 6h that the DRX mechanism at the strain rate of 0.01 s −1 is still the CDRX mechanism.…”

“…The influence of strain rate on texture is mainly reflected in the strain rate having a slight influence on the deformation temperature, and the higher strain rate can cause the local temperature to rise. Xu et al [10] reported that the compressive strain rate of Mg–9Gd–2.9Y–1.9Zn–0.4Zr–0.2Ca alloy was carried out 10 s −1 , which would lead to an adiabatic shear band due to the local temperature rise caused by the high strain rate, and DRX would occur near the shear band. However, this is mainly affected by the lower temperature, and the increase of deformation rate at a lower temperature will lead to a significant temperature rise.…”

“…Li et al [9] reported that when the Mg–Gd–Y–Zr alloy was subjected to a compressive deformation with a strain of 0.7 at 350 °C, a large number of twins appeared in the coarse original grains due to the limited activation of the slip system. Xu et al [10] reported that when the compression experiment of Mg–9Gd–2.9Y–1.9Zn–0.2Ca alloy with a strain of 0.9 was carried out at 350 °C, no twinning was observed due to the hindrance of a large number of lamellar LPSO phases. Zhang et al [11] used the compression deformation of Mg 6 Gd 3 Y 1 Zn 0.4 Zr to study the influence of the LPSO phase with different morphologies on the dynamic recrystallized grain (DRX) process, and founded that the high-density lamellar LPSO phase hindered the opening of the base slip and the activation of the kink deformation, and at the same time hindered the DRX process.…”

“…Hagihara et al [12] confirmed that the (0001) [11,12,13,14,15,16,17,18,19,20] basal dislocation slip is the main deformation mode of the LPSO phase. Xu et al [10] reported that when the loading direction of compression deformation was basically parallel to the base plane of the LPSO phase, the base slip was difficult to open due to having a low Schmid factor. At this time, the kink band of the LPSO phase is adapted to the deformation by the generation and the synchronous slip of the dislocation pairs of the opposite sign of the base plane.…”

Effect of Isothermal Repetitive Upsetting Extrusion on the Microstructure of Mg-12.0Gd-4.5Y-2.0Zn-0.4Zr Alloy

“…The microstructure evolution during different RUE passes can be seen in EBSD orientation maps obtained from the transverse cross-sections, as seen in Figure 7b,d,f. The large black regions in the maps, marked by white circles, correspond to LPSO phases because of the Kikuchi diffraction patterns were not recognized by the orientation image mapping (OIM) system [20]. As seen in Figure 7a,b, after one RUE pass, the accumulated strains reached 1.35, and many coarse initial grains remained.…”