Avalanches, plasticity, and ordering in colloidal crystals under compression

McDermott, D.; Reichhardt, C. J.  Olson; Reichhardt, C.

doi:10.1103/PhysRevE.93.062607

Title: Avalanches, plasticity, and ordering in colloidal crystals under compression

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Abstract

Using numerical simulations we examine colloids with a long-range Coulomb interaction confined in a two-dimensional trough potential undergoing dynamical compression. As the depth of the confining well is increased, the colloids move via elastic distortions interspersed with intermittent bursts or avalanches of plastic motion. In these avalanches, the colloids rearrange to minimize their colloid-colloid repulsive interaction energy by adopting an average lattice constant that is isotropic despite the anisotropic nature of the compression. The avalanches take the form of shear banding events that decrease or increase the structural order of the system. At larger compression, the avalanches are associated with a reduction of the number of rows of colloids that fit within the confining potential, and between avalanches the colloids can exhibit partially crystalline or anisotropic ordering. The colloid velocity distributions during the avalanches have a non-Gaussian form with power law tails and exponents that are consistent with those found for the velocity distributions of gliding dislocations. We observe similar behavior when we subsequently decompress the system, and find a partially hysteretic response reflecting the irreversibility of the plastic events.

Authors:

McDermott, D. ^[1]; Reichhardt, C. J. Olson ^[2]; Reichhardt, C. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Wabash College, Crawfordsville, IN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:: Mon Jun 13 00:00:00 EDT 2016

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS); USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS)

OSTI Identifier:: 1492573

Alternate Identifier(s):: OSTI ID: 1256994

Report Number(s):: LA-UR-15-21492
Journal ID: ISSN 2470-0045; PLEEE8

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review E

Additional Journal Information:: Journal Volume: 93; Journal Issue: 6; Journal ID: ISSN 2470-0045

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Material Science

Citation Formats


                    McDermott, D., Reichhardt, C. J.  Olson, and Reichhardt, C. Avalanches, plasticity, and ordering in colloidal crystals under compression.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevE.93.062607.

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                    McDermott, D., Reichhardt, C. J.  Olson, & Reichhardt, C. Avalanches, plasticity, and ordering in colloidal crystals under compression.  United States.  https://doi.org/10.1103/PhysRevE.93.062607

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                    McDermott, D., Reichhardt, C. J.  Olson, and Reichhardt, C. Mon .  
"Avalanches, plasticity, and ordering in colloidal crystals under compression".  United States.  https://doi.org/10.1103/PhysRevE.93.062607.  https://www.osti.gov/servlets/purl/1492573.

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@article{osti_1492573,

  title        = {Avalanches, plasticity, and ordering in colloidal crystals under compression},

  author       = {McDermott, D. and Reichhardt, C. J.  Olson and Reichhardt, C.},

  abstractNote = {Using numerical simulations we examine colloids with a long-range Coulomb interaction confined in a two-dimensional trough potential undergoing dynamical compression. As the depth of the confining well is increased, the colloids move via elastic distortions interspersed with intermittent bursts or avalanches of plastic motion. In these avalanches, the colloids rearrange to minimize their colloid-colloid repulsive interaction energy by adopting an average lattice constant that is isotropic despite the anisotropic nature of the compression. The avalanches take the form of shear banding events that decrease or increase the structural order of the system. At larger compression, the avalanches are associated with a reduction of the number of rows of colloids that fit within the confining potential, and between avalanches the colloids can exhibit partially crystalline or anisotropic ordering. The colloid velocity distributions during the avalanches have a non-Gaussian form with power law tails and exponents that are consistent with those found for the velocity distributions of gliding dislocations. We observe similar behavior when we subsequently decompress the system, and find a partially hysteretic response reflecting the irreversibility of the plastic events.},

  doi          = {10.1103/PhysRevE.93.062607},

  journal      = {Physical Review E},

  number       = 6,

  volume       = 93,

  place        = {United States},

  year         = {Mon Jun 13 00:00:00 EDT 2016},

  month        = {Mon Jun 13 00:00:00 EDT 2016}

}

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