Martensitic transformation induced dislocation walls in Fe₄₂Mn₃₈Co₁₀Cr₁₀ high-entropy alloy

Two types of hitherto unreported dislocation walls in a cold-deformed Fe₄₂Mn₃₈Co₁₀Cr₁₀ (at.%) high-entropy alloy are characterized using aberration-corrected scanning transmission electron microscopy at the atomic-scale. Both walls are located at the interface between two parallel and juxtaposed martensite lamellae, although they are respectively constituted by all-30° mixed or all-90° edge Shockley partial dislocations. Within each of these two walls, two different sets of Shockley partials that have Burgers vectors of the same magnitude but opposite signs are arranged alternately on successive basal planes of the hexagonal lattice. The interfaces containing such compact dislocation walls are expected to contribute to strain hardening and plastic accommodation via various dislocation-interface interactions.