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Damage-tolerance can be an elusive characteristic of structural materialsrequiring both high strength and ductility, properties that are often mutuallyexclusive. High-entropy alloys are of interest in this regard. Specifically,the single-phase CrMnFeCoNi alloy displays tensile strength levels of ~1 GPa,excellent ductility (~60-70%) and exceptional fracture toughness (KJIc > 200MPa/m). Here, through the use of in-situ straining in an aberration-correctedtransmission electron microscope, we report on the salient atomistic tomicro-scale mechanisms underlying the origin of these properties. We identify asynergy of multiple deformation mechanisms, rarely achieved in metallic alloys,which generates high strength, work hardening and ductility, including the easymotion of Shockley partials, their interactions to form stacking-faultparallelepipeds, and arrest at planar-slip bands of undissociated dislocations.We further show that crack propagation is impeded by twinned, nano-scalebridges that form between the near-tip crack faces and delay fracture byshielding the crack tip.

Nanoscale Origins of the Damage Tolerance of the High-Entropy Alloy CrMnFeCoNi