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Plasticity in diamond nanoparticles: dislocations and amorphization during loading and dislocation multiplication during unloading.

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Title: Plasticity in diamond nanoparticles: dislocations and amorphization during loading and dislocation multiplication during unloading.
Authors: Aquistapace, Franco1 (AUTHOR), Castillo-Castro, Daniel2 (AUTHOR), González, Rafael I.2,3 (AUTHOR), Amigo, Nicolás4 (AUTHOR), García Vidable, Gonzalo5 (AUTHOR), Tramontina, Diego R.5 (AUTHOR), Valencia, Felipe J.6 (AUTHOR), Bringa, Eduardo M.2,5 (AUTHOR) ebringa@yahoo.com
Source: Journal of Materials Science. Mar2024, Vol. 59 Issue 12, p4788-4809. 22p.
Subjects: Amorphization, Loading & unloading, Dislocation density, Diamonds, Nanodiamonds, Density of states
Abstract: This work focuses on the mechanical response of cubic-diamond nanoparticles of several sizes when subjected to a planar indenter. Three sequential stages were considered, i.e., loading, unloading, and reloading. In the large anisotropic strain regime, standard structure detectors stop identifying atoms as having diamond structures, affecting the ability to detect dislocations. A machine learning-assisted structure detector, MultiSOM, is able to detect a significantly larger number of crystalline diamond atoms and also identify much larger dislocation densities. MultiSOM also detects a distorted diamond phase and directional amorphization, similar to what has been observed for other covalent solids at high strain. After unloading, there is a large elastic recovery and significant amorphization remains. It is remarkable that dislocation density increases during unloading, unlike what happens for most materials, where there are large reductions due to dislocation reactions and surface sinks. This "anomalous" behavior is likely associated with low dislocation mobility in diamond, but also with a large number of junctions, which increases with dislocation density and reduces even further dislocation mobility. The unloaded state includes a dense dislocation network that withstands high-temperature annealing. Analysis of the vibrational density of states (VDOS) during recovery is consistent with significant recovery of the crystalline diamond phase. Reloading of the nanoparticles shows lower strength, without significant dislocation growth. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Plasticity in diamond nanoparticles: dislocations and amorphization during loading and dislocation multiplication during unloading.
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  Data: <searchLink fieldCode="AR" term="%22Aquistapace%2C+Franco%22">Aquistapace, Franco</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Castillo-Castro%2C+Daniel%22">Castillo-Castro, Daniel</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22González%2C+Rafael+I%2E%22">González, Rafael I.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Amigo%2C+Nicolás%22">Amigo, Nicolás</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22García+Vidable%2C+Gonzalo%22">García Vidable, Gonzalo</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tramontina%2C+Diego+R%2E%22">Tramontina, Diego R.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Valencia%2C+Felipe+J%2E%22">Valencia, Felipe J.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bringa%2C+Eduardo+M%2E%22">Bringa, Eduardo M.</searchLink><relatesTo>2,5</relatesTo> (AUTHOR)<i> ebringa@yahoo.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%22">Journal of Materials Science</searchLink>. Mar2024, Vol. 59 Issue 12, p4788-4809. 22p.
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  Label: Abstract
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  Data: This work focuses on the mechanical response of cubic-diamond nanoparticles of several sizes when subjected to a planar indenter. Three sequential stages were considered, i.e., loading, unloading, and reloading. In the large anisotropic strain regime, standard structure detectors stop identifying atoms as having diamond structures, affecting the ability to detect dislocations. A machine learning-assisted structure detector, MultiSOM, is able to detect a significantly larger number of crystalline diamond atoms and also identify much larger dislocation densities. MultiSOM also detects a distorted diamond phase and directional amorphization, similar to what has been observed for other covalent solids at high strain. After unloading, there is a large elastic recovery and significant amorphization remains. It is remarkable that dislocation density increases during unloading, unlike what happens for most materials, where there are large reductions due to dislocation reactions and surface sinks. This "anomalous" behavior is likely associated with low dislocation mobility in diamond, but also with a large number of junctions, which increases with dislocation density and reduces even further dislocation mobility. The unloaded state includes a dense dislocation network that withstands high-temperature annealing. Analysis of the vibrational density of states (VDOS) during recovery is consistent with significant recovery of the crystalline diamond phase. Reloading of the nanoparticles shows lower strength, without significant dislocation growth. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10853-023-09223-7
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        Text: English
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      – SubjectFull: Amorphization
        Type: general
      – SubjectFull: Loading & unloading
        Type: general
      – SubjectFull: Dislocation density
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      – SubjectFull: Diamonds
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      – SubjectFull: Nanodiamonds
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      – SubjectFull: Density of states
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      – TitleFull: Plasticity in diamond nanoparticles: dislocations and amorphization during loading and dislocation multiplication during unloading.
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              M: 03
              Text: Mar2024
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