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Title: Ductility and work hardening in nano-sized metallic glasses

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.
Authors:
 [1] ;  [2] ; ;  [3] ;  [1] ;  [4]
  1. Division of Engineering and Applied Sciences, California Institute of Technology, Pasadena, California 91125 (United States)
  2. Department of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125 (United States)
  3. Materials and Process Simulation Center, California Institute of Technology, Pasadena, California 91125 (United States)
  4. (United States)
Publication Date:
OSTI Identifier:
22412601
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; DEFORMATION; DUCTILITY; ION BEAMS; METALLIC GLASSES; MOLECULAR DYNAMICS METHOD; NANOSTRUCTURES; NICKEL PHOSPHIDES; RELAXATION; STRAIN HARDENING; STRAINS; STRESSES; SURFACES; US NIPER