High tensile ductility in a nanostructured metal

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A finite-strain elastic–plastic Cosserat theory for polycrystals with grain rotations (2006, background): “The necessity for macroscopic problems to incorporate internal length scale effects has been demonstrated in [120].”
Review on superior strength and enhanced ductility of metallic nanomaterials (2018, background): “It should be noted that such level of ultimate tensile stress can hardly be reached in Cu nanostructured by the other techniques [373,374] and in the case it is achieved the elongation to failure drops to less than 3% [373,375].”
Mechanical properties, microstructure and thermal stability of a nanocrystalline CoCrFeMnNi high-entropy alloy after severe plastic deformation (2015, background): “For example, with heat treatments the ductility can be markedly improved while keeping the loss of strength at an acceptable level [53].”