Powder metallurgy methods such as spark plasma sintering (SPS) are conventionally used for the fabrication of high entropy alloys (HEAs). However, the phase constituents of SPS-processed HEAs can deviate from thermodynamic predictions. With the aid of heat treatment (HT), the phase composition of HEAs can be controlled. In this study, HT at various temperatures (450, 650, and 1000 °C) was conducted on the sintered AlCoCrFeNi samples. According to microstructural studies, HT at 450 and 650 °C only slightly changed the BCC and FCC phase contents, but HT at 1000 °C led to increased FCC and decreased BCC phase fractions. Among the major phases of AlCoCrFeNi, the BCC phase exhibits greater hardness and H/E (strain to failure), and the FCC phase possesses better ductility. Therefore, due to higher BCC content, the wear rate of the sample without HT (2.61 mm³/N.m) was lower than that of the sample heat-treated at 1000 °C (3.15 mm³/N.m). On the other hand, due to the higher FCC content, the sample with HT at 1000 °C showed better compressive properties (σy = 1723 MPa, σf = 2223 MPa, and ϵ = 15%). The investigation of wear mechanisms showed that abrasive, adhesive, delamination, and oxidative mechanisms occurred in the worn samples. Also, in the fracture surfaces of samples signs of ductile fracture and brittle fracture were observed.

粉末冶金方法，如放电等离子烧结 (SPS)，通常用于制造高熵合金 (HEA)。然而，SPS 处理的 HEA 的相成分可能会偏离热力学预测。借助热处理 (HT)，可以控制 HEA 的相组成。在这项研究中，对烧结的 AlCoCrFeNi 样品进行了不同温度（450、650 和 1000 °C）的 HT。根据微观结构研究，450 和 650 °C 的 HT 仅略微改变 BCC 和 FCC 相含量，但 1000 °C 的 HT 导致 FCC 增加和 BCC 相分数降低。在 AlCoCrFeNi 的主要相中，BCC 相具有更高的硬度和 H/E（失效应变），而 FCC 相具有更好的延展性。因此，由于 BCC 含量较高，没有 HT 的样品的磨损率 (2.³ /Nm)低于在1000°C热处理的样品(3.15 mm ³ /Nm)。另一方面，由于 FCC 含量较高，HT 在 1000 °C 的样品表现出更好的压缩性能（σy = 1723 MPa，σf = 2223 MPa，ε = 15%）。磨损机制的研究表明，磨损样品中发生了磨料、粘附、分层和氧化机制。此外，在样品的断口中观察到韧性断裂和脆性断裂的迹象。