Organizational Evolution during Performance Meritocracy of AlSi0.5CrxCo0.2Ni Lightweight High Entropy Alloys

The Al-Si-Cr-Co-Ni High Entropy Alloy (HEA) with low density (about 5.4 g/cm3) and excellent performance had significant potential in the lightweight engineering material field. To further research optimize system HEA, influences of element Cr on microstructures performances AlSi0.5CrxCo0.2Ni (in mole ratio, x = 1.0, 1.2, 1.4, 1.6, 1.8) HEAs were investigated. experiment results manifested that composed A2 (Cr-rich), B2 (Ni-Al), Cr3Si phases, indicating addition did not result formation a new phase. However, ample increased phase composition, ensuring high hardness (average HV 981.2) HEAs. Electrochemical tests demonstrated elevated phases afforded greater corrosion resistance, improvement was more pronounced when > 1.6. This work is crucial development HEAs, which are tremendous practical utility fields cutting tools, hard coating, etc.