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Title: Optimum high temperature strength of two-dimensional nanocomposites

High-temperature nanoindentation was used to reveal nano-layer size effects on the hardness of two-dimensional metallic nanocomposites. We report the existence of a critical layer thickness at which strength achieves optimal thermal stability. Transmission electron microscopy and theoretical bicrystal calculations show that this optimum arises due to a transition from thermally activated glide within the layers to dislocation transmission across the layers. We demonstrate experimentally that the atomic-scale properties of the interfaces profoundly affect this critical transition. The strong implications are that interfaces can be tuned to achieve an optimum in high temperature strength in layered nanocomposite structures.
Authors:
;  [1] ; ; ; ;  [2] ;  [3] ;  [1] ;  [4]
  1. IMDEA Materials Institute, C/Eric Kandel 2, 28906 Getafe, Madrid (Spain)
  2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  3. Czech Technical University in Prague, Technická 2, Prague 6 (Czech Republic)
  4. (Spain)
Publication Date:
OSTI Identifier:
22269589
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 1; Journal Issue: 5; Other Information: (c) 2013 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; COMPOSITE MATERIALS; DISLOCATIONS; HARDNESS; INTERFACES; LAYERS; NANOSTRUCTURES; STABILITY; TEMPERATURE RANGE 0400-1000 K; THICKNESS; TRANSMISSION; TRANSMISSION ELECTRON MICROSCOPY