High-entropy alloy particles have excellent mechanical properties and have potential uses as reinforcing materials. In this study, AZ91D-based composites reinforced with AlCrFeCoNi particles were fabricated using a squeeze casting technology. The average grain size of the AZ91D–AlCrFeCoNi composites was reduced from 95.4 μm (0 vol.%) to 81.5 μm (10 vol.%). Several particle clusters occurred in the 5 vol.% and 10 vol.% composites. Transmission electron microscopy analysis showed that strong interfacial bonding between AlCrFeCoNi and α-Mg was present due to the formation of semi-coherent interfaces. The AlCrFeCoNi particles were found to have a substantial influence on the mechanical properties of the composite; it was found that composites with 3 vol.% AlCrFeCoNi had the highest yield strength (95.1 MPa) and tensile strength (180.0 MPa) as well as the largest elongation 1.1%; the composites with 10 vol.% AlCrFeCoNi particles resulted in the samples with the highest micro-hardness (105.2 HV). The excellent mechanical properties that were obtained could be attributed to the refined grain size and the stress transfer between the AlCrFeCoNi particles and the Mg matrix.

高熵合金颗粒具有优异的力学性能，具有作为增强材料的潜在用途。在这项研究中，使用挤压铸造技术制造了用 AlCrFeCoNi 颗粒增强的 AZ91D 基复合材料。AZ91D-AlCrFeCoNi 复合材料的平均晶粒尺寸从 95.4 μm (0 vol.%) 减小到 81.5 μm (10 vol.%)。在 5 vol.% 和 10 vol.% 的复合材料中出现了几个粒子簇。透射电子显微镜分析表明，由于半共格界面的形成，AlCrFeCoNi 和 α-Mg 之间存在强界面键合。发现 AlCrFeCoNi 颗粒对复合材料的机械性能有很大影响；发现具有 3 vol.% AlCrFeCoNi 的复合材料具有最高的屈服强度 (95.1 MPa) 和拉伸强度 (180. 0 MPa)以及最大伸长率1.1%；具有 10 vol.% AlCrFeCoNi 颗粒的复合材料产生了具有最高显微硬度 (105.2 HV) 的样品。获得的优异机械性能可归因于细化的晶粒尺寸和 AlCrFeCoNi 颗粒与 Mg 基体之间的应力传递。