Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity
The plastic behaviour of individual Cu crystallites under nanoextrusion is studied by molecular dynamics simulations. Single-crystal Cu fcc nanoparticles are embedded in a spherical force field mimicking the effect of a contracting carbon shell, inducing pressure on the system in the range of gigapa...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2013-03-01
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| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.4.17 |
| _version_ | 1828427465425420288 |
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| author | Antti Tolvanen Karsten Albe |
| author_facet | Antti Tolvanen Karsten Albe |
| author_sort | Antti Tolvanen |
| collection | DOAJ |
| description | The plastic behaviour of individual Cu crystallites under nanoextrusion is studied by molecular dynamics simulations. Single-crystal Cu fcc nanoparticles are embedded in a spherical force field mimicking the effect of a contracting carbon shell, inducing pressure on the system in the range of gigapascals. The material is extruded from a hole of 1.1–1.6 nm radius under athermal conditions. Simultaneous nucleation of partial dislocations at the extrusion orifice leads to the formation of dislocation dendrites in the particle causing strain hardening and high flow stress of the material. As the extrusion orifice radius is reduced below 1.3 Å we observe a transition from displacive plasticity to solid-state amorphisation. |
| first_indexed | 2024-12-10T17:02:11Z |
| format | Article |
| id | doaj.art-33c5b745fa4d4a02b67732f10d6d89d6 |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-10T17:02:11Z |
| publishDate | 2013-03-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-33c5b745fa4d4a02b67732f10d6d89d62022-12-22T01:40:32ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862013-03-014117317910.3762/bjnano.4.172190-4286-4-17Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticityAntti Tolvanen0Karsten Albe1Technische Universität Darmstadt, Institut für Materialwissenschaft, Fachgebiet Materialmodellierung, Petersenstr. 32, 64287 Darmstadt, GermanyTechnische Universität Darmstadt, Institut für Materialwissenschaft, Fachgebiet Materialmodellierung, Petersenstr. 32, 64287 Darmstadt, GermanyThe plastic behaviour of individual Cu crystallites under nanoextrusion is studied by molecular dynamics simulations. Single-crystal Cu fcc nanoparticles are embedded in a spherical force field mimicking the effect of a contracting carbon shell, inducing pressure on the system in the range of gigapascals. The material is extruded from a hole of 1.1–1.6 nm radius under athermal conditions. Simultaneous nucleation of partial dislocations at the extrusion orifice leads to the formation of dislocation dendrites in the particle causing strain hardening and high flow stress of the material. As the extrusion orifice radius is reduced below 1.3 Å we observe a transition from displacive plasticity to solid-state amorphisation.https://doi.org/10.3762/bjnano.4.17dislocation interactionsmechanical propertiesmolecular dynamicsnanoparticlesimulation |
| spellingShingle | Antti Tolvanen Karsten Albe Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity Beilstein Journal of Nanotechnology dislocation interactions mechanical properties molecular dynamics nanoparticle simulation |
| title | Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity |
| title_full | Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity |
| title_fullStr | Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity |
| title_full_unstemmed | Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity |
| title_short | Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity |
| title_sort | plasticity of cu nanoparticles dislocation dendrite induced strain hardening and a limit for displacive plasticity |
| topic | dislocation interactions mechanical properties molecular dynamics nanoparticle simulation |
| url | https://doi.org/10.3762/bjnano.4.17 |
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