Polycrystalline Ni nanotubes under compression: a molecular dynamics study
Author
dc.contributor.author
Rojas Núñez, J.
Author
dc.contributor.author
Baltazar, S. E.
Author
dc.contributor.author
González, R. I.
Author
dc.contributor.author
Bringa, E. M.
Author
dc.contributor.author
Allende, S.
Author
dc.contributor.author
Kiwi, M.
Author
dc.contributor.author
Valencia, F. J.
Admission date
dc.date.accessioned
2021-08-09T19:33:30Z
Available date
dc.date.available
2021-08-09T19:33:30Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
RMD Open 2020;6
es_ES
Identifier
dc.identifier.other
10.1038/s41598-020-76276-y
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/181174
Abstract
dc.description.abstract
Mechanical properties of nanomaterials, such as nanowires and nanotubes, are an important feature for the design of novel electromechanical nano-architectures. Since grain boundary structures and surface modifications can be used as a route to modify nanostructured materials, it is of interest to understand how they affect material strength and plasticity. We report large-scale atomistic simulations to determine the mechanical response of nickel nanowires and nanotubes subject to uniaxial compression. Our results suggest that the incorporation of nanocrystalline structure allows completely flexible deformation, in sharp contrast with single crystals. While crystalline structures at high compression are dominated by dislocation pinning and the multiplication of highly localized shear regions, in nanocrystalline systems the dislocation distribution is significantly more homogeneous. Therefore, for large compressions (large strains) coiling instead of bulging is the dominant deformation mode. Additionally, it is observed that nanotubes with only 70% of the nanowire mass but of the same diameter, exhibit similar mechanical behavior up to 0.3 strain. Our results are useful for the design of new flexible and light-weight metamaterials, when highly deformable struts are required.
es_ES
Patrocinador
dc.description.sponsorship
DICYT Project
041931BR
USA1799 Vridei 041931SB_GO
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT PIA/BASAL
AFB180001
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT
1190662
11190484
11180557
1200867
1190727
ANPCyT
PICT-2014-0696
SIIP-UNCuyo Grant
06/M104
NLHPC
ECM-02
HPC USACH-SEGIC
ECM-02