Dislocation array reflection enhances strain hardening of a dual-phase heterostructured high-entropy alloy

Piling-ups of geometrically necessary dislocation (GND) arrays against interfaces are known to produce hetero-deformation induced (HDI) strengthening and strain hardening enhance the strength ductility heterostructured materials. Here we report an interesting mechanism that can strong HDI hardening: consecutive reflections GND planar piling-up near opposite phase boundaries in a AlCoCrFeNi2 high entropy alloy (HEA). In contrast, transmission was found at grain fcc phase. The discovery here provides guidance for future materials design, which may improve combination metallic