Intragranular Dispersion of Carbon Nanotubes Comprehensively Improves Aluminum Alloys
Name
So_et_al-2018-Advanced_Science.pdf
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1.49 MB
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Author(s)
Park, Jong Gil
Keum, Dong Hoon
Jeong, Hye Yun
Yao, Fei
Joo, Soo Hyun
Kim, Hyoung Seop
Kim, Hwanuk
Lee, Young Hee
So, Kangpyo
Kushima, Akihiro
Date Issued
July 2018
Journal
Advanced Science
Publisher
Wiley Blackwell
Citation
So, Kang Pyo et al. “Intragranular Dispersion of Carbon Nanotubes Comprehensively Improves Aluminum Alloys.” Advanced Science 5, 7 (April 2018): 1800115 © 2018 The Authors
Version
Final published version
Abstract
The room-temperature tensile strength, toughness, and high-temperature creep strength of 2000, 6000, and 7000 series aluminum alloys can be improved significantly by dispersing up to 1 wt% carbon nanotubes (CNTs) into the alloys without sacrificing tensile ductility, electrical conductivity, or thermal conductivity. CNTs act like forest dislocations, except mobile dislocations cannot annihilate with them. Dislocations cannot climb over 1D CNTs unlike 0D dispersoids/precipitates. Also, unlike 2D grain boundaries, even if some debonding happens along 1D CNT/alloy interface, it will be less damaging because fracture intrinsically favors 2D percolating flaws. Good intragranular dispersion of these 1D strengtheners is critical for comprehensive enhancement of composite properties, which entails change of wetting properties and encapsulation of CNTs inside Al grains via surface diffusion-driven cold welding. In situ transmission electron microscopy demonstrates liquid-like envelopment of CNTs into Al nanoparticles by cold welding.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1002/advs.201800115
