Open AccessOptimum high temperature strength of two-dimensional nanocomposites
Author(s) -
M.A. Monclús,
Shijian Zheng,
Jason R. Mayeur,
Irene J. Beyerlein,
Nathan A. Mara,
Tomáš Polcar,
Javier LLorca,
J.M. Molina-Aldareguía
Publication year - 2013
Publication title -
apl materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.571
H-Index - 60
ISSN - 2166-532X
DOI - 10.1063/1.4828757
Subject(s) - materials science , nanoindentation , nanocomposite , transmission electron microscopy , thermal stability , composite material , dislocation , layer (electronics) , nanoscopic scale , transition layer , thermal , nanotechnology , chemical engineering , thermodynamics , physics , engineering
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
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