Applied Physics Letters · 2004 · 232 citations · 11 references
Natural SciencesMaterials EngineeringMaterials ScienceMetallic MaterialsMetallurgyThin FilmsAlloysMetalsNanomechanicsStainless SteelsStrengthening MechanismsThin-film MaterialsAustenitic Stainless SteelsHardnessHigh-resolution Transmission Electron MicroscopyNanoscale PlasticityNanoscale StrengtheningPlastic Deformation At The NanoscaleTwin BoundariesTwinning-induced Strengthening
Magnetron-sputter-deposited austenitic 330 stainless steel (330 SS) films, several microns thick, were found to have a hardness ∼6.5 GPa, about an order of magnitude higher than bulk 330 SS. High-resolution transmission electron microscopy revealed that sputtered 330 SS coatings are heavily twinned on {111} with nanometer scale twin spacing. Molecular dynamics simulations show that, in the nanometer regime where plasticity is controlled by the motion of single rather than pile-ups of dislocations, twin boundaries are very strong obstacles to slip. These observations provide a new perspective to producing ultrahigh strength monolithic metals by utilizing growth twins with nanometer-scale spacing.
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High tensile ductility in a nanostructured metal
Yinmin Wang, Mingwei Chen, Fenghua Zhou et al. · Nature · 2002 · 2.9K citations
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