Metal matrix composites have been developed to overcome the urgent demand of light-weight design. High entropy alloys (HEAs) are newly emerged as a new kind of potential reinforcement for metals due to their outstanding physical and mechanical properties. Here, a kind of novel Al matrix composite reinforced by Al_0.8CoCrFeNi HEA particles was fabricated by multi-pass friction stir processing (FSP). The incorporated HEA particles were homogeneously distributed into the composites and maintained the structural integrity. The average grain size of the FSPed composites decreased from 4.6 μm of Al matrix to 2.8 μm due to the particle-stimulated nucleation mechanism. The hardness, yield strength and ultimate tensile strength of the FSPed composites increased by 56%, 42% and 22% than that of the FSPed Al matrix with no obvious decrease of elongation. Interfacial diffusion occurred and the interfacial region is confirmed to be the Al₃CoCrFeNi rather than the intermetallic phases. HEA particles have great potentials in mechanical properties enhancement for conventional light-weight alloys.

已经开发出金属基复合材料来克服轻量化设计的迫切需求。高熵合金（HEA）由于其出色的物理和机械性能而作为一种潜在的金属增强材料而新出现。在这里，一种新型的Al _0.8增强的Al基复合材料CoCrFeNi HEA颗粒是通过多次摩擦搅拌工艺（FSP）制成的。掺入的HEA颗粒均匀分布在复合材料中，并保持结构完整性。FSPed复合材料的平均晶粒尺寸从4.6μm的Al基体减少到2.8μm，这归因于颗粒刺激的成核机理。FSPed复合材料的硬度，屈服强度和极限拉伸强度比FSPed Al基体提高了56％，42％和22％，而伸长率没有明显降低。发生了界面扩散，界面区域被确认为Al ₃ CoCrFeNi而不是金属间相。HEA颗粒具有提高常规轻质合金力学性能的巨大潜力。