The temperature dependence of the compressive deformation behavior of the Mg₈₈Zn₇Y₅ alloy with a high volume fraction (~85%) of the long-period stacking-ordered (LPSO) phase was studied by in-situ synchrotron radiation diffraction. The as-extruded microstructure exhibits a fully recrystallized α-Mg phase with a nearly random texture. The LPSO phase, identified as the 18R polytype, is represented by wavy lamellae elongated along the extrusion direction and has an intensive basal texture. The alloy compressed along the extrusion direction at room temperature shows a superior yield strength of 480 MPa. With increasing deformation temperature, the yield strength is reduced by 15% at 200 °C and by 46% at 300 °C, respectively. At all tested temperatures, the basal slip is activated in the α-Mg matrix far below the yield strength. The macroscopic yielding of the alloy is controlled by the activation of deformation kinking in the LPSO phase. The synchrotron radiation diffraction data indicate the stress localization at kinks with respect to the grains having the same orientation.

通过原位研究了具有高体积分数 (~85%) 长周期堆积有序 (LPSO) 相的 Mg ₈₈ Zn ₇ Y ₅合金的压缩变形行为的温度依赖性同步辐射衍射。挤压态显微组织呈现出完全再结晶的 α-Mg 相，具有近乎随机的织构。LPSO 相，被确定为 18R 多型，由沿挤压方向拉长的波浪状薄片表示，并具有密集的基底纹理。在室温下沿挤压方向压缩的合金显示出 480 MPa 的优异屈服强度。随着变形温度的升高，屈服强度在 200 °C 和 300 °C 时分别降低 15% 和 46%。在所有测试温度下，基体滑移在远低于屈服强度的 α-Mg 基体中被激活。合金的宏观屈服由 LPSO 相中变形扭结的激活控制。