Ductility and work hardening in nano-sized metallic glasses

作者：Chen D Z^*; Gu X W; An Q; Goddard W A III; Greer J R

来源：Applied Physics Letters, 2015, 106(6): 061903.

DOI：10.1063/1.4907773

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.

• 出版日期2015-2-9