Ton-scale metal–carbon nanotube composite: The mechanism of strengthening while retaining tensile ductility

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Title
Ton-scale metal–carbon nanotube composite: The mechanism of strengthening while retaining tensile ductility
Author(s)
Kang Pyo So; Xiaohui Liu; Hideki Mori; Akihiro Kushima; Jong Gil Park; Hyoung Seop Kim; Shigenobu Ogata; Young Hee Lee; Ju Li
Publication Date
2016-09
Journal
EXTREME MECHANICS LETTERS, v.8, no., pp.245 - 250
Publisher
ELSEVIER SCIENCE BV
Abstract
One-dimensional carbon nanotubes (CNT), which are mechanically strong and flexible, enhance strength of the host metal matrix. However, the reduction of ductility is often a serious drawback. Here, we report significantly enhanced plastic flow strength, while preventing tensile ductility reduction, by uniformly dispersing CNTs in Al matrix. Nanoscale plasticity and rupturing processes near CNTs were observed by in-situ mechanical tests inside Transmission Electron Microscope (TEM). CNTs act like forest dislocations and have comparable density (∼1014/m2), and such 1D nano-dispersion hardening is studied in detail by in situ TEM and molecular dynamics simulations. Rupture-front blunting and branching are seen with in situ TEM, which corroborates the result from macro-scale tension tests that our Al + CNT nanocomposite is quite damage- and fault-tolerant. We propose a modified shear-lag model called ‘‘Taylor-dispersion’’ hardening model to highlight the dual roles of CNTs as load-bearing fillers and ‘‘forest dislocations’’ equivalent that harden the metal matrix, for the plastic strength of metal + CNT nanocomposite. © 2016 Elsevier Ltd.
URI
https://pr.ibs.re.kr/handle/8788114/3124
ISSN
2352-4316
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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