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Title: Harnessing mechanical instabilities at the nanoscale to achieve ultra-low stiffness metals

Abstract

Alloy and microstructure optimization have led to impressive improvements in the strength of engineering metals, while the range of Young’s moduli achievable has remained essentially unchanged. This is because stiffness is insensitive to microstructure and bounded by individual components in composites. Here we design ultra-low stiffness in fully dense, nanostructured metals via the stabilization of a mechanically unstable, negative stiffness state of a martensitic alloy by its coherent integration with a compatible, stable second component. Explicit large-scale molecular dynamics simulations of the metamaterials with state of the art potentials confirm the expected ultra-low stiffness while maintaining full strength. We find moduli as low as 2 GPa, a value typical of soft materials and over one order of magnitude lower than either constituent, defying long-standing composite bounds. Furthermore, such properties are attractive for flexible electronics and implantable devices. Our concept is generally applicable and could significantly enhance materials science design space.

Authors:
ORCiD logo [1];  [2];  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Imperial College, London (United Kingdom)
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1499683
Grant/Contract Number:  
FG02-07ER46399
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Reeve, Samuel Temple, Belessiotis-Richards, Alexis, and Strachan, Alejandro. Harnessing mechanical instabilities at the nanoscale to achieve ultra-low stiffness metals. United States: N. p., 2017. Web. doi:10.1038/s41467-017-01260-6.
Reeve, Samuel Temple, Belessiotis-Richards, Alexis, & Strachan, Alejandro. Harnessing mechanical instabilities at the nanoscale to achieve ultra-low stiffness metals. United States. https://doi.org/10.1038/s41467-017-01260-6
Reeve, Samuel Temple, Belessiotis-Richards, Alexis, and Strachan, Alejandro. Thu . "Harnessing mechanical instabilities at the nanoscale to achieve ultra-low stiffness metals". United States. https://doi.org/10.1038/s41467-017-01260-6. https://www.osti.gov/servlets/purl/1499683.
@article{osti_1499683,
title = {Harnessing mechanical instabilities at the nanoscale to achieve ultra-low stiffness metals},
author = {Reeve, Samuel Temple and Belessiotis-Richards, Alexis and Strachan, Alejandro},
abstractNote = {Alloy and microstructure optimization have led to impressive improvements in the strength of engineering metals, while the range of Young’s moduli achievable has remained essentially unchanged. This is because stiffness is insensitive to microstructure and bounded by individual components in composites. Here we design ultra-low stiffness in fully dense, nanostructured metals via the stabilization of a mechanically unstable, negative stiffness state of a martensitic alloy by its coherent integration with a compatible, stable second component. Explicit large-scale molecular dynamics simulations of the metamaterials with state of the art potentials confirm the expected ultra-low stiffness while maintaining full strength. We find moduli as low as 2 GPa, a value typical of soft materials and over one order of magnitude lower than either constituent, defying long-standing composite bounds. Furthermore, such properties are attractive for flexible electronics and implantable devices. Our concept is generally applicable and could significantly enhance materials science design space.},
doi = {10.1038/s41467-017-01260-6},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {Thu Oct 26 00:00:00 EDT 2017},
month = {Thu Oct 26 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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Citation Metrics:
Cited by: 11 works
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Web of Science

Figures / Tables:

Fig. 1 Fig. 1 : Free energy landscape engineering in NiAl. Free energy as a function of in-plane lattice parameter from MD simulations of bulk Ni63Al37 and NiAl, interpolated with rule of mixtures. The combination of 65 at% Ni63Al37 (thick red) and 35 at% NiAl (thick blue) is highlighted in black tomore » show the possibility of ultra-low stiffness. The martensite and austenite are labeled for Ni63Al37. The inset shows a schematic of the epitaxial interface between NiAl and Ni63Al37 where Al atoms are light blue, Ni in NiAl is dark blue, and Ni in Ni63Al37 is red. Note that this atomic coloring is unique to this figure« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.