Analytical model of the effect of misfit dislocation character on the bubble-to-void transition in metals
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
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.
- Research Organization:
- 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 Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-06NA25396; 2008LANL1026
- OSTI ID:
- 1422961
- Alternate ID(s):
- OSTI ID: 1359396
- Report Number(s):
- LA-UR-15-28835; TRN: US1801677
- Journal Information:
- Journal of Nuclear Materials, Vol. 469, Issue C; ISSN 0022-3115
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Formation of misfit dislocation arrays and helium nanochannels near copper surface assisted by high-temperature graphene deposition
Misfit dislocations arranged in a hexagonal networks in anisotropic elasticity. Related displacement field and stored elastic energy