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Title: Morphological stability of Cu-Nb nanocomposites under high-energy collision cascades

We use molecular dynamics and phase field simulations to demonstrate that Cu-Nb multilayered nanocomposites with individual layer thicknesses above 2–4 nm remain morphologically stable when subjected to 100 keV collision cascades, characteristic of neutron or heavy ion irradiation. The probability of morphological instability rapidly increases as the layer thickness decreases to 1 nm, which we attribute to overlap of zones of liquid-like interdiffusion inside radiation-induced thermal spikes at neighboring interfaces in the multilayer.
Authors:
 [1] ;  [2]
  1. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
  2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
22218212
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 6; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COLLISIONS; COMPOSITE MATERIALS; COPPER ALLOYS; HEAVY IONS; INSTABILITY; INTERFACES; ION BEAMS; IRRADIATION; KEV RANGE 10-100; LAYERS; LIQUIDS; MOLECULAR DYNAMICS METHOD; MORPHOLOGY; NANOSTRUCTURES; NEUTRONS; NIOBIUM ALLOYS; STABILITY; THERMAL SPIKES; THICKNESS