Abstract Microstructure, texture and mechanical properties of Mg–5Zn-0.3Y-0.2Ce alloys with the addition of trace xCa (x = 0, 0.3, 0.6 wt%) were systematically investigated in this work. The results revealed that more secondary eutectic phases and smaller grain size of as-cast microstructure could be found with increasing Ca content. After hot extrusion, the Ca-free alloy showed a uniformly recrystallized grain structure, while the Ca-containing alloys possessed a bimodal grain structure composed of fine dynamic recrystallized (DRXed) grains with a size of several microns and un-recrystallized coarse grains. EBSD analysis showed that the three extruded alloys had a fiber texture of (0001) basal plane aligned with the extrusion direction. Texture intensity of the DRXed region was weaker than the deformed region. The extruded alloy with the addition of 0.6 wt% Ca exhibited the highest yield strength of 321MPa due to the smallest DRXed grain size, the deformed region with strong basal texture and dense nanosized precipitates.

中文翻译：

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微合金化Ca对Mg-Zn-Y-Ce合金组织、织构和力学性能的影响

摘要 在这项工作中系统地研究了添加微量 xCa (x = 0, 0.3, 0.6 wt%) 的 Mg-5Zn-0.3Y-0.2Ce 合金的显微组织、织构和机械性能。结果表明，随着Ca含量的增加，可以发现更多的二次共晶相和更小的铸态组织晶粒。热挤压后，无钙合金显示出均匀的再结晶晶粒结构，而含钙合金具有双峰晶粒结构，由几微米大小的动态再结晶（DRXed）晶粒和未再结晶的粗晶粒组成。EBSD 分析表明，三种挤压合金具有 (0001) 基面与挤压方向对齐的纤维织构。DRX 区域的纹理强度弱于变形区域。