Intragranular Dispersion of Carbon Nanotubes Comprehensively Improves Aluminum Alloys
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; Liu, Xiaohui; Li, Ju; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
So, Kang Pyo et al. “Intragranular Dispersion of Carbon Nanotubes Comprehensively Improves Aluminum Alloys.” Advanced Science 5, 7 (April 2018): 1800115 © 2018 The Authors
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