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 bicryst...

Full description

Saved in:
Bibliographic Details
Published inAPL materials Vol. 1; no. 5
Main Authors Monclús, M. A., Molina-Aldareguía, J. M., Zheng, S. J., Mayeur, J. R., Beyerlein, I. J., Mara, N. A., Polcar, T., Llorca, J., Department of Materials Science, Polytechnic University of Madrid, E. T. S. de Ingenieros de Caminos, 28040 Madrid
Format Journal Article
LanguageEnglish
Published United States 01.11.2013
Subjects
COMPOSITE MATERIALS
DISLOCATIONS
HARDNESS
INTERFACES
LAYERS
MATERIALS SCIENCE
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
STABILITY
TEMPERATURE RANGE 0400-1000 K
THICKNESS
TRANSMISSION
TRANSMISSION ELECTRON MICROSCOPY
Online AccessGet full text

Cover

More Information
Summary: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.
ISSN:2166-532X
2166-532X
DOI:10.1063/1.4828757