Ductility and work hardening in nano-sized metallic glasses
DZ Chen and XW Gu and Q An and WA Goddard and JR Greer, APPLIED PHYSICS LETTERS, 106, 061903 (2015).
In-situ nano-tensile experiments on 70 nm-diameter free-standing electroplated NiP metallic glass nanostructures reveal tensile true strains of similar to 18%, an amount comparable to compositionally identical 100 nm-diameter focused ion beam samples and similar to 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. (C) 2015 AIP Publishing LLC.
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