Enhanced fatigue resistance of Cu with a gradient nanograined surface layer

By Lijing Yang, N. Tao, Ke Lu, Lei Lu. 2013

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Literature review on the mechanical properties of materials after surface mechanical attrition treatment (SMAT) (2020, background): “It is reported that a short annealing between temperatures from 300 C to 500 C results in a 20% increase in strength combined with enhanced ductility as compared to the as-nanostructured Cu [158].”
Improved fatigue resistance of gradient nanograined Cu (2019, background): “At the same time, a much greater fatigue endurance limit under stress-controlled cyclic deformation (so-called high-cycle fatigue), arises from the presence of surface GNG structure, which not only contributes to the high fatigue strength but also suppresses strain localization and increases the res”
On the impact toughness of gradient-structured metals (2020, background): “Early studies on many GS materials [11,12,20,21] involved section thicknesses of only a few hundred micrometers, which can rarely satisfy the size requirements for realistic fracture toughness measurement ( e.g ., as per ASTM Standard 1820 [22]).”