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High strain rate compressive deformation behavior of nickel microparticles.

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Title: High strain rate compressive deformation behavior of nickel microparticles.
Authors: Bellón, Bárbara1 (AUTHOR) b.bellon@mpie.de, Bhaskar, Lalith Kumar1 (AUTHOR), Brink, Tobias1 (AUTHOR), Aymerich-Armengol, Raquel1 (AUTHOR), Sonawane, Dipali1 (AUTHOR), Chatain, Dominique2 (AUTHOR), Dehm, Gerhard1 (AUTHOR), Ramachandramoorthy, Rajaprakash1 (AUTHOR) r.ram@mpie.de
Source: Materials Today. Aug2025, Vol. 87, p90-102. 13p.
Subjects: Mechanical properties of metals, Dislocation nucleation, Microparticles, Nickel films, Molecular dynamics, Heterogenous nucleation
Abstract: [Display omitted] Understanding the mechanical properties of metals at extreme conditions is essential for the advancement of miniaturized technologies. As dimensions decrease, materials will experience higher strain rates at the same applied velocities. Moreover, the interplay effects of strain rates and temperatures are often overlooked and could have critical effects in applications. In this study, for the first time, the rate-dependent and temperature-dependent mechanical response of nickel microparticles has been investigated. The microparticles were obtained by solid-state dewetting of nickel thin films deposited on c-sapphire. They exhibit self-similar shapes with identical sets of planes, facilitating straightforward comparison between particles. This research represents the first in-depth analysis of the mechanical properties of nickel single crystal dewetted microparticles across six orders of magnitude at room temperature and three orders of magnitude at 128 K. Molecular dynamics simulations (MD) were conducted in parallel on particles with the same faceting. In this work, the gap between experiments and simulations has been reduced to one order of magnitude in size and 3 orders of magnitude in the strain rates. Thermal activation parameter analysis and MD simulations were employed to ascertain whether homogeneous or heterogeneous dislocation nucleation was the dominant mechanism controlling deformation in the particles. [ABSTRACT FROM AUTHOR]
Copyright of Materials Today is the property of Elsevier B.V. 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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 185834542
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PubType: Academic Journal
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  Data: High strain rate compressive deformation behavior of nickel microparticles.
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  Data: <searchLink fieldCode="AR" term="%22Bellón%2C+Bárbara%22">Bellón, Bárbara</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> b.bellon@mpie.de</i><br /><searchLink fieldCode="AR" term="%22Bhaskar%2C+Lalith+Kumar%22">Bhaskar, Lalith Kumar</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Brink%2C+Tobias%22">Brink, Tobias</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aymerich-Armengol%2C+Raquel%22">Aymerich-Armengol, Raquel</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sonawane%2C+Dipali%22">Sonawane, Dipali</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chatain%2C+Dominique%22">Chatain, Dominique</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dehm%2C+Gerhard%22">Dehm, Gerhard</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ramachandramoorthy%2C+Rajaprakash%22">Ramachandramoorthy, Rajaprakash</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> r.ram@mpie.de</i>
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  Data: <searchLink fieldCode="JN" term="%22Materials+Today%22">Materials Today</searchLink>. Aug2025, Vol. 87, p90-102. 13p.
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  Data: [Display omitted] Understanding the mechanical properties of metals at extreme conditions is essential for the advancement of miniaturized technologies. As dimensions decrease, materials will experience higher strain rates at the same applied velocities. Moreover, the interplay effects of strain rates and temperatures are often overlooked and could have critical effects in applications. In this study, for the first time, the rate-dependent and temperature-dependent mechanical response of nickel microparticles has been investigated. The microparticles were obtained by solid-state dewetting of nickel thin films deposited on c-sapphire. They exhibit self-similar shapes with identical sets of planes, facilitating straightforward comparison between particles. This research represents the first in-depth analysis of the mechanical properties of nickel single crystal dewetted microparticles across six orders of magnitude at room temperature and three orders of magnitude at 128 K. Molecular dynamics simulations (MD) were conducted in parallel on particles with the same faceting. In this work, the gap between experiments and simulations has been reduced to one order of magnitude in size and 3 orders of magnitude in the strain rates. Thermal activation parameter analysis and MD simulations were employed to ascertain whether homogeneous or heterogeneous dislocation nucleation was the dominant mechanism controlling deformation in the particles. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Materials Today is the property of Elsevier B.V. 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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      – Type: doi
        Value: 10.1016/j.mattod.2025.05.014
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      – Code: eng
        Text: English
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        PageCount: 13
        StartPage: 90
    Subjects:
      – SubjectFull: Mechanical properties of metals
        Type: general
      – SubjectFull: Dislocation nucleation
        Type: general
      – SubjectFull: Microparticles
        Type: general
      – SubjectFull: Nickel films
        Type: general
      – SubjectFull: Molecular dynamics
        Type: general
      – SubjectFull: Heterogenous nucleation
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      – TitleFull: High strain rate compressive deformation behavior of nickel microparticles.
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            – D: 01
              M: 08
              Text: Aug2025
              Type: published
              Y: 2025
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