Fig. 4: Strain hardening behaviour of the as-printed Al₁₉Co₂₀Fe₂₀Ni₄₁ EHEA.

a Strain hardening curve of the as-printed EHEA corresponding to Fig. 2a. The orange arrow indicates the inflexion point in the strain hardening curve. b MD simulations showing the dislocation behaviour in the respective FCC and BCC lamellae at different stages of deformation. The stacking faults are marked by orange atoms and the dislocations are coloured in dark and light blue based on their types. c HRTEM image showing the formation of stacking faults and Lomer–Cottrell locks. d BF-STEM image demonstrating the increase of dislocations (indicated by yellow arrows) in both FCC and BCC lamellae, and the pile-up of dislocations along lamellar interfaces (indicated by white arrows). e HAADF-STEM image showing slip transmission across the FCC/BCC lamellar interface, indicated by yellow arrows. The inserted diffraction pattern indicates the Kurdjumov–Sachs orientation relationship of the lamellar interface.