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Article overview
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From Brittle to Ductile: A Structure Dependent Ductility of Diamond Nanothread | Haifei Zhan
; Gang Zhang
; Vincent BC Tan
; Yuan Cheng
; John M. Bell
; Yong-Wei Zhang
; Yuantong Gu
; | Date: |
5 Nov 2015 | Abstract: | As a potential building block for the next generation of devices or
multifunctional materials that are spreading almost every technology sector,
one-dimensional (1D) carbon nanomaterial has received intensive research
interests. Recently, a new ultra-thin diamond nanothread (DNT) has joined this
palette, which is a 1D structure with poly-benzene sections connected by
Stone-Wales (SW) transformation defects. Using large-scale molecular dynamics
simulations, we found that this sp3 bonded DNT can transit from a brittle to a
ductile characteristic by varying the length of the poly-benzene sections,
suggesting that DNT possesses entirely different mechanical responses than
other 1D carbon allotropies. Analogously, the SW defects behave like a grain
boundary that interrupts the consistency of the poly-benzene sections. For a
DNT with a fixed length, the yield strength fluctuates in the vicinity of a
certain value and is independent of the "grain size". On the other hand, both
yield strength and yield strain show a clear dependence on the total length of
DNT, which is due to the fact that the failure of the DNT is dominated by the
SW defects. Its highly tunable ductility together with its ultra-light density
and high Young’s modulus makes diamond nanothread ideal for creation of
extremely strong three-dimensional nano-architectures. | Source: | arXiv, 1511.1583 | Services: | Forum | Review | PDF | Favorites |
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