Fig. 1. Schematic diagram of selective laser melting and formed specimen of alloy

Fig. 2. XRD patterns of AlCoCrFeNi high entropy alloy formed by SLM at different temperatures. (a) XRD patterns; (b) local amplification

Fig. 3. Cross-sectional microstructures of AlCoCrFeNi high entropy alloy before and after heat treatment. (a) Initial sample; samples after heat treatment at (b) 650, (c) 850, (d) 1050, (e) 1250 ℃

Fig. 4. Element distributions of AlCoCrFeNi high entropy alloy after heat treatment at 1250 ℃. (a) Microstructure; (b) Al element; (c) Co element; (d) Cr element; (e) Fe element; (f) Ni element

Fig. 5. Element compositions of BCC phase and FCC phase after heat treatment of AlCoCrFeNi high entropy alloy. (a) BCC phase element composition; (b) FCC phase element composition

Fig. 6. Surface microhardness and surface residual stress of AlCoCrFeNi high entropy alloy formed by SLM before and after heat treatment

Fig. 7. Corrosion resistance of alloy samples in H₂SO₄ solution with concentration of 0.5 mol/L before and after heat treatment.

Fig. 8. Model diagram of impedance equivalent circuit for high entropy alloy sample formed by SLM

Fig. 9. Corrosion morphologies of alloy samples in H₂SO₄ solution with concentration of 0.5 mol/L before and after heat treatment.

Fig. 10. Electrochemical corrosion model of alloy in H₂SO₄ solution with concentration of 0.5 mol/L. (a) 650 ℃ heat treatment;