Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 120, Issue -, Pages 278-295Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2019.05.006
Keywords
Metal matrix composites (MMCs); Carbon nanotubes; Microstructure; Strain hardening
Funding
- Ministry of Education of China [62501036031, B16032]
- Natural Science Foundation of China [51671130, 51771110, 51771111, 51871149]
- Ministry of Science & Technology of China [2016YFB1200506, 2016YFE0130200, 2017YFB1201105]
- Aeronautical Science Foundation of China [2016ZF57011]
- China Scholarship Council [201706230098]
- Shanghai Science and Technology Committee [15JC1402100, 17ZR1441500, 14DZ2261200, 14520710100]
- Conseil Regional du Nord-Pas de Calais
- European Regional Development Fund
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The present work investigates structure-mechanical property correlations of carbon nanotube/aluminum (CNT/Al) composites through characterization and microstructure-based modeling. The nanoscale architecture of these composites, produced by flake powder metallurgy, was established using a transmission electron microscope equipped with an automated crystal orientation mapping system. The architecture mainly consists of elongated Al grains with sub micron widths and micron lengths, intergranular CNTs and an interfacial reaction product, namely Al4C3 particles. The stress-strain behavior found with our dislocation-boundary/reinforcement interaction mechanical model, matched our experimental tensile curves. This model was also used to predict several key factors, namely grain dimensions, CNTs volume fraction, intergranular or intragranular distribution and aspect ratio, interfacial reaction rate, impacting tensile strength and ductility. It was found that intergranular CNTs induced strengthening will not result in lower uniform elongations, while intragranular distribution of low aspect ratio CNTs and Al4C3 nanoparticles can increase both strength and uniform elongations by the Orowan mechanism. It is expected that the model in the present work can assist in microstructure design of metal matrix nanocomposites.
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