Ductility and work hardening in nano-sized metallic glasses
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In-situ nano-tensile experiments on 70?nm-diameter free-standing electroplated NiP metallic glass nanostructures reveal tensile true strains of ?18%, an amount comparable to compositionally identical 100?nm-diameter focused ion beam samples and ?3 times greater than 100?nm-diameter electroplated samples. Simultaneous in-situ observations and stress-strain data during post-elastic deformation reveal necking and work hardening, features uncharacteristic for metallic glasses. The evolution of free volume within molecular dynamics-simulated samples suggests a free surface-mediated relaxation mechanism in nano-sized metallic glasses.
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