Fig. 1. Atomic evolution morphology of Ni₆₀Al₂₀V₂₀ middle entropy alloy during precipitation at 1050 K: (a) t = 1000; (b) t = 3000; (c) t = 9000; (d) t = 40000; (e) t = 80000; (f) t = 500000

Fig. 2. Structural sketches of L1₀, L1₂ and DO₂₂: (a) L1₀; (b) L1₂; (c) DO₂₂

Fig. 3. Atom evolution morphology in Ni₇₅Al_7.5V_17.5 alloy precipitated at 1050 K: (a) t = 6000; (b) t = 8000; (c) t = 16000

Fig. 4. Order parameter distribution of ordered phase in Ni₆₀Al₂₀V₂₀ middle entropy alloy at different time: (a) Composition order parameter; (b) long-range order parameter.

Fig. 5. Order parameter distribution in a particle of Ni₆₀Al₂₀V₂₀ medium entropy alloy at different time: (a) Composition order parameter; (b) long range-order parameter.

Fig. 6. Variation of volume fraction of ordered phases in Ni₆₀Al₂₀V₂₀ alloy with time: (a) L1₂ phase; (b) DO₂₂ phase.

Fig. 7. Average order parameter profiles in the ordered phase: (a) Overall change; (b) local change.

Fig. 8. Evolutions of different atomic site occupation in Ni₆₀Al₂₀V₂₀ MEA: (a) α site; (b) β site.

Fig. 9. Average long-range order parameter curves of and phases in Ni₆₀Al₂₀V₂₀ medium entropy alloy: (a) phase; (b) phase.

Fig. 10. Variation of interatomic interaction potential in Ni₆₀Al₂₀V₂₀ medium entropy alloy with long-range ordered parameters.

Fig. 11. Temperature dependence of the interatomic interaction potential in Ni₆₀Al₂₀V₂₀ medium entropy alloy.