Analytical model of the effect of misfit dislocation character on the bubble-to-void transition in metals

Martínez, Enrique; Schwen, Daniel; Hetherly, Jeffrey; Caro, A.

doi:10.1016/j.jnucmat.2015.11.046

Title: Analytical model of the effect of misfit dislocation character on the bubble-to-void transition in metals

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Abstract

Here, this paper addresses the role of misfit dislocations in the nucleation and growth of nanoscale He bubbles at interfaces. In a recent work, we studied the nanoscale effects on the capillarity equation and on equilibrium conditions. We proposed an expression for surface energy and for the equation of state, EOS, for He in bubbles, which have a size dependence that captures the role of the interface forces, which become relevant at the nanoscale. Here we determine the EOS for several twist grain boundaries in Fe and Cu and incorporate these results into the rate equation that determines the bubble-to-void transition, focusing on the influence of interface dislocations on the evaporation rate of vacancies. We find a significant effect of the magnitude of the Burgers vector of the dislocations on the critical radius for the transition. In conclusion, these results give a quantitative way to characterize grain boundaries in their ability to capture He and alter the onset of swelling.

Authors:

Martínez, Enrique ^[1]; Schwen, Daniel ^[2]; Hetherly, Jeffrey ^[1]; Caro, A. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States)

Publication Date:: Mon Nov 30 00:00:00 EST 2015

Research Org.:: Energy Frontier Research Centers (EFRC) (United States). Center for Materials at Irradiation and Mechanical Extremes (CMIME); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1422961

Alternate Identifier(s):: OSTI ID: 1359396

Report Number(s):: LA-UR-15-28835
Journal ID: ISSN 0022-3115; TRN: US1801677

Grant/Contract Number:: AC52-06NA25396; 2008LANL1026

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Nuclear Materials

Additional Journal Information:: Journal Volume: 469; Journal Issue: C; Journal ID: ISSN 0022-3115

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Segregation; Diffusion; Irradiation

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                    Martínez, Enrique, Schwen, Daniel, Hetherly, Jeffrey, and Caro, A. Analytical model of the effect of misfit dislocation character on the bubble-to-void transition in metals.  United States: N. p., 2015. 
Web.  doi:10.1016/j.jnucmat.2015.11.046.

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                    Martínez, Enrique, Schwen, Daniel, Hetherly, Jeffrey, & Caro, A. Analytical model of the effect of misfit dislocation character on the bubble-to-void transition in metals.  United States.  https://doi.org/10.1016/j.jnucmat.2015.11.046

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                    Martínez, Enrique, Schwen, Daniel, Hetherly, Jeffrey, and Caro, A. Mon .  
"Analytical model of the effect of misfit dislocation character on the bubble-to-void transition in metals".  United States.  https://doi.org/10.1016/j.jnucmat.2015.11.046.  https://www.osti.gov/servlets/purl/1422961.

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@article{osti_1422961,

  title        = {Analytical model of the effect of misfit dislocation character on the bubble-to-void transition in metals},

  author       = {Martínez, Enrique and Schwen, Daniel and Hetherly, Jeffrey and Caro, A.},

  abstractNote = {Here, this paper addresses the role of misfit dislocations in the nucleation and growth of nanoscale He bubbles at interfaces. In a recent work, we studied the nanoscale effects on the capillarity equation and on equilibrium conditions. We proposed an expression for surface energy and for the equation of state, EOS, for He in bubbles, which have a size dependence that captures the role of the interface forces, which become relevant at the nanoscale. Here we determine the EOS for several twist grain boundaries in Fe and Cu and incorporate these results into the rate equation that determines the bubble-to-void transition, focusing on the influence of interface dislocations on the evaporation rate of vacancies. We find a significant effect of the magnitude of the Burgers vector of the dislocations on the critical radius for the transition. In conclusion, these results give a quantitative way to characterize grain boundaries in their ability to capture He and alter the onset of swelling.},

  doi          = {10.1016/j.jnucmat.2015.11.046},

  journal      = {Journal of Nuclear Materials},

  number       = C,

  volume       = 469,

  place        = {United States},

  year         = {Mon Nov 30 00:00:00 EST 2015},

  month        = {Mon Nov 30 00:00:00 EST 2015}

}

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