Optimization of Al/V Ratio in FeMnNiCr High‐Entropy Alloys for Enhanced Hardness and Wear Resistance via a High‐Throughput Strategy

High‐entropy alloys (HEAs) have attracted significant attention as promising candidates for a wide range of applications, particularly their excellent wear‐resistant properties. In this study, a diffusion couple with a nominal composition of Fe 45 (Al/V) 20 Mn 18 Ni 12 Cr 5 is fabricated through electron beam welding encapsulation combined with hot isostatic pressing. The effect of the Al–V concentration gradient on the material's hardness is investigated, and a correlation between composition and hardness is established. The composition points exhibiting superior hardness are selected for alloy synthesis, which is followed by heat treatments under various conditions. The combined addition of Al and V in a specific range is found to improve the wear resistance of HEAs. However, excessive V content, although contributing to enhanced hardness and wear resistance, also elevated the risk of embrittlement. The Fe 47.77 V 16.80 Mn 16.58 Ni 9.77 Cr 5.63 Al 3.47 HEA, subjected to solution treatment at 1 000 °C for 10 h and followed by aging at 700 °C for 12 h, demonstrated the highest wear resistance, with a wear rate of 4.892 × 10 −6 mm −3 N m −1 , ≈75% lower than the commercial high‐speed steel. Morphological analysis identified abrasive wear and delamination wear as the dominant wear mechanisms. The present work provides an efficient method for designing HEAs with optimized hardness and wear resistance.