为探明片状增强体对镁基复合材料的调控机制，研究不同形态可变形金属颗粒增强镁基复合材料的可行性，本工作深入探究了Ti微片(Ti_ms)片化程度对Ti_ms/ZX50显微组织、力学性能、加工硬化与软化行为的影响。采用球磨工艺对Ti颗粒(Ti_p)进行片化处理，并基于该工艺调控Ti_ms的片化程度。通过半固态搅拌铸造方法将Ti_ms引入Mg-5Zn-0.5Ca (ZX50)合金中，成功制备了Ti_ms/ZX50复合材料，随后对其进行热挤压处理，研究Ti_ms的片化程度对ZX50合金显微组织与力学性能的影响。结果表明，随Ti_ms片化程度提升，其硬度显著增大。而在热挤压过程中，由于Ti_ms对变形的协调作用，其硬度下降。Ti_ms能够有效促进动态再结晶和动态析出，随片化程度的提升，ZX50基体再结晶晶粒尺寸减小，析出MgZn₂相的数量增加。Ti_ms对再结晶的影响呈现出方向性，与垂直于挤压方向相比，Ti_ms/ZX50复合材料在平行于挤压方向的晶粒尺寸更小，且随Ti_ms片化程度的增加，两方向的晶粒尺寸差值增大。此外，随Ti_ms片化程度的增加，Ti_ms/ZX50复合材料的强度、加工硬化率和软化速率均显示出上升的趋势，而软化率表现出先增加后减小的特征。当Ti_ms径厚比增加到1.2时，伴随MgZn₂相数量的增加，软化率逐渐降低。在载荷传递强化、位错强化、细晶强化的共同作用下，Ti_ms/ZX50复合材料的强度逐渐增加。

To enhance the mechanical properties of magnesium alloys and elucidate the regulatory mechanisms of flake-like structures in composites, while also exploring the feasibility of using deformable metallic particles with varying morphologies to reinforce magnesium matrix composites, this study systematically investigated the influence of deformable Ti microslices (Ti_ms) with varying slicing degrees on the microstructure and properties of magnesium matrix composites. Ti particles were processed into sheets via ball milling process to control the slicing degree of the Ti_ms. These Ti_ms were introduced into an Mg–5Zn–0.5Ca (ZX50) alloy via semisolid stirring casting to successfully fabricate Ti_ms/ZX50 composites. The composites subsequently underwent hot extrusion to examine the effect of Ti_ms’ slicing degree on the microstructure and mechanical properties of the ZX50 alloy. The results indicate that the hardness of Ti_ms increased significantly with higher slicing degrees but decreased markedly during the hot-extrusion process. Ti_ms effectively regulated dynamic recrystallization and precipitation by altering the strain and load distribution within the matrix. As the slicing degree increased, the recrystallized grain size of the ZX50 matrix decreased, and the number of precipitated MgZn₂ phases increased. The influence of Ti_ms on recrystallization exhibited directionality, with finer grain sizes parallel to the extrusion direction than those perpendicular to it. Furthermore, the grain-size disparity grew with increasing Ti_ms’ slicing degree. Additionally, the strength, work-hardening rate, and softening rate of Ti_ms/ZX50 composites generally increased with increasing Ti_ms slicing degrees, although the softening ratio initially increased and subsequently decreased. When the average aspect ratio of Ti_ms reached 1.2, the softening rate progressively decreased as the quantity of MgZn₂ phases increased. Under the synergistic effects of load-transfer, dislocation, and grain-refinement strengthening, the strength of the Ti_ms/ZX50 composites gradually increased, with grain-refinement strengthening being the most significant contributor.