<p>Co-free high-entropy alloys (HEAs) have garnered significant interest for their high cost-performance ratios and wide-ranging potential applications. This study investigates the microstructural evolution, tensile properties, and corrosion resistance of Co-free dual-phase AlCr_xCuFeNi₂ HEAs with varying Cr content (0.75 ≤ <i>x</i> ≤ 2.5). The results show that increasing Cr content can promote the formation of the BCC/B2 phase, and the proportion of BCC/B2 phase increases from 37.4 to 98.3%. Additionally, the morphology of the BCC phase in B2 matrix undergoes significant changes, with the dendritic structure becoming finer and the lattice constant increasing. The moderate amount of Cr content significantly increases the tensile strength value of the alloy, which reaches a maximum of 1110.55&#xa0;MPa when <i>x</i> = 1.5. However, when <i>x</i> ≥ 2.0, an increase in Cr content resulted in significant decrease in tensile strength. This is because the brittle B2 phase within the FCC matrix provides pathways for the propagation of microcracks. In the 3.5&#xa0;wt% NaCl solution, moderate amount of Cr content promotes the formation of stable passivation film, reduces the corrosion potential (<i>E</i>_corr) and corrosion current density (<i>I</i>_corr), and increases the polarization resistance (<i>R</i>_P). When <i>x</i> = 1.75, the alloy has the best electrochemical corrosion resistance.</p>