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Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity.
Beilstein J Nanotechnol. 2013; 4:173-9.BJ

Abstract

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.

Authors+Show Affiliations

Technische Universität Darmstadt, Institut für Materialwissenschaft, Fachgebiet Materialmodellierung, Petersenstr. 32, 64287 Darmstadt, Germany ; Department of Physics, FIN-0014 University of Helsinki, PO Box 43, Helsinki, Finland.No affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

23616936

Citation

Tolvanen, Antti, and Karsten Albe. "Plasticity of Cu Nanoparticles: Dislocation-dendrite-induced Strain Hardening and a Limit for Displacive Plasticity." Beilstein Journal of Nanotechnology, vol. 4, 2013, pp. 173-9.
Tolvanen A, Albe K. Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity. Beilstein J Nanotechnol. 2013;4:173-9.
Tolvanen, A., & Albe, K. (2013). Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity. Beilstein Journal of Nanotechnology, 4, 173-9. https://doi.org/10.3762/bjnano.4.17
Tolvanen A, Albe K. Plasticity of Cu Nanoparticles: Dislocation-dendrite-induced Strain Hardening and a Limit for Displacive Plasticity. Beilstein J Nanotechnol. 2013;4:173-9. PubMed PMID: 23616936.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Plasticity of Cu nanoparticles: Dislocation-dendrite-induced strain hardening and a limit for displacive plasticity. AU - Tolvanen,Antti, AU - Albe,Karsten, Y1 - 2013/03/07/ PY - 2012/10/10/received PY - 2013/02/12/accepted PY - 2013/4/26/entrez PY - 2013/4/26/pubmed PY - 2013/4/26/medline KW - dislocation interactions KW - mechanical properties KW - molecular dynamics KW - nanoparticle KW - simulation SP - 173 EP - 9 JF - Beilstein journal of nanotechnology JO - Beilstein J Nanotechnol VL - 4 N2 - 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. SN - 2190-4286 UR - https://www.unboundmedicine.com/medline/citation/23616936/Plasticity_of_Cu_nanoparticles:_Dislocation_dendrite_induced_strain_hardening_and_a_limit_for_displacive_plasticity_ L2 - https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23616936/ DB - PRIME DP - Unbound Medicine ER -
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