High entropy alloys (HEAs) attract more and more attention due to their simple structure, high strength and hardness, good ductility, and excellent softening, oxidation, corrosion, and wear resistance properties. Among the known HEA systems, the AlCoCrFeNi alloy exhibits complicated microstructure and excellent mechanical properties. In this study, the AlCoCrFeNi/TiB₂ composites were prepared via power metallurgy route in combination with spark plasma sintering (SPS) technology. At first, the AlCoCrFeNi HEA powders were prepared by gas-atomization technology under Ar atmosphere with the high purity of raw elemental materials. The commercial TiB2 powders with average particle size of about 2 μm were used as the reinforcing agent to prepare the AlCoCrFeNi/TiB₂ composites. The effect of TiB₂ content on the phase, microstructure, and tribological properties of the synthesized AlCoCrFeNi/TiB₂ composites were investigated by XRD, SEM, and EPMA, whereas also through friction and wear tests. The results show that phase transformation occurs with σ phase formation after sintering. The TiB2 particles tend to agglomerate and grow up with increased TiB₂ content. The effect of TiB2 on the tribological behavior of the composites was studied through measuring the coefficient of friction (COF) and wear rate (W). The resulting values of COF and W show that the wear resistance of AlCoCrFeNi/TiB₂ composites is improved with increasing the TiB₂ content.

高熵合金（HEA）由于其简单的结构，高强度和硬度，良好的延展性以及出色的软化，氧化，腐蚀和耐磨性而受到越来越多的关注。在已知的HEA系统中，AlCoCrFeNi合金表现出复杂的微观结构和优异的机械性能。在这项研究中，AlCoCrFeNi / TiB ₂复合材料是通过动力冶金法结合火花等离子体烧结（SPS）技术制备的。首先，在Ar气氛下通过气雾化技术制备了AlCoCrFeNi HEA粉末，并获得了高纯度的原始原料。使用平均粒径约为2μm的市售TiB2粉末作为增强剂来制备AlCoCrFeNi / TiB ₂复合材料。通过XRD，SEM和EPMA研究了TiB ₂含量对合成的AlCoCrFeNi / TiB ₂复合材料的相，微观结构和摩擦学性能的影响，同时还通过摩擦和磨损测试进行了研究。结果表明，在烧结后，随着σ相的形成而发生相变。TiB2颗粒倾向于聚集并随着TiB ₂含量的增加而长大。通过测量摩擦系数（COF）和磨损率（W），研究了TiB2对复合材料摩擦性能的影响。COF和W的结果表明，随着TiB ₂含量的增加，AlCoCrFeNi / TiB ₂复合材料的耐磨性得到改善。