Review on superior strength and enhanced ductility of metallic nanomaterials

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Ductility by shear band delocalization in the nano-layer of gradient structure (2018, background): “saturation dislocation density [2,3,9,10], both of which limit dislocation accumulation capability during tensile testing [9–11].”
In-situ observation of dislocation dynamics near heterostructured interfaces (2019, background): “Interface engineering such as introducing twins [4,5], second-phases [6,7], and grain refinement [1] have been extensively reported for improving the strength and/or ductility of metals.”
Ductility and Plasticity of Nanostructured Metals: Differences and Issues (2018, background): “There are also cases in which m is relatively large at room temperature for nanostructured metals with low melting temperatures [5,10,11].”
Critical microstructures and defects in heterostructured materials and their effects on mechanical properties (2020, background): “However, diverse deformation mechanisms in nanostructured materials are yet incapable of providing good ductility, because of their limited strain hardening capabilities [10].”