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Title: Formation and self-organization of void superlattices under irradiation: A phase field study

Abstract

Self-organized patterns, realized in non-equilibrium processes, have been widely observed in physics and chemistry. As a powerful tool to create far-from-equilibrium environments, irradiation produces a variety of types of defects, which can self-organize through physical interactions and chemical reactions. Such a process becomes complicated especially when both thermodynamics and kinetics play critical roles in pattern formation. Here, we explore the formation and self-organization mechanism of void superlattices in metals and alloys under irradiation through phase field modeling and simulations. For the first time, three different formation mechanisms of void superlattices are clearly distinguished according to their thermodynamic origin and reaction kinetics. It is discovered that the characteristic length and symmetry of an emerging superlattice is determined by the interplay of the thermodynamic driving force and the kinetic anisotropy of the system. Through parametric study, the effects of kinetic coefficients, such as atomic mobility and irradiation dose rate, on the nucleation, growth, coarsening, coalescence, and ordering of voids are systematically investigated. The theoretical model developed in this work may provide guidelines for designing desired self-organized microstructures under irradiation.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1564270
Alternate Identifier(s):
OSTI ID: 1704024
Report Number(s):
INL/JOU-17-43207-Rev000
Journal ID: ISSN 2589-1529; TRN: US2000900
Grant/Contract Number:  
AC07-05ID14517
Resource Type:
Accepted Manuscript
Journal Name:
Materialia
Additional Journal Information:
Journal Volume: 1; Journal Issue: C; Journal ID: ISSN 2589-1529
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; irradiation induced void superlattice

Citation Formats

Gao, Yipeng, Zhang, Yongfeng, Schwen, Daniel, Jiang, Chao, Sun, Cheng, and Gan, Jian. Formation and self-organization of void superlattices under irradiation: A phase field study. United States: N. p., 2018. Web. doi:10.1016/j.mtla.2018.04.003.
Gao, Yipeng, Zhang, Yongfeng, Schwen, Daniel, Jiang, Chao, Sun, Cheng, & Gan, Jian. Formation and self-organization of void superlattices under irradiation: A phase field study. United States. https://doi.org/10.1016/j.mtla.2018.04.003
Gao, Yipeng, Zhang, Yongfeng, Schwen, Daniel, Jiang, Chao, Sun, Cheng, and Gan, Jian. Wed . "Formation and self-organization of void superlattices under irradiation: A phase field study". United States. https://doi.org/10.1016/j.mtla.2018.04.003. https://www.osti.gov/servlets/purl/1564270.
@article{osti_1564270,
title = {Formation and self-organization of void superlattices under irradiation: A phase field study},
author = {Gao, Yipeng and Zhang, Yongfeng and Schwen, Daniel and Jiang, Chao and Sun, Cheng and Gan, Jian},
abstractNote = {Self-organized patterns, realized in non-equilibrium processes, have been widely observed in physics and chemistry. As a powerful tool to create far-from-equilibrium environments, irradiation produces a variety of types of defects, which can self-organize through physical interactions and chemical reactions. Such a process becomes complicated especially when both thermodynamics and kinetics play critical roles in pattern formation. Here, we explore the formation and self-organization mechanism of void superlattices in metals and alloys under irradiation through phase field modeling and simulations. For the first time, three different formation mechanisms of void superlattices are clearly distinguished according to their thermodynamic origin and reaction kinetics. It is discovered that the characteristic length and symmetry of an emerging superlattice is determined by the interplay of the thermodynamic driving force and the kinetic anisotropy of the system. Through parametric study, the effects of kinetic coefficients, such as atomic mobility and irradiation dose rate, on the nucleation, growth, coarsening, coalescence, and ordering of voids are systematically investigated. The theoretical model developed in this work may provide guidelines for designing desired self-organized microstructures under irradiation.},
doi = {10.1016/j.mtla.2018.04.003},
journal = {Materialia},
number = C,
volume = 1,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:

Figures / Tables:

FIG. 1 FIG. 1: Simulation results of the formation of a square void superlattice. Dimensionless time $t$: (a) 836, (b) 876, (c) 948, (d) 1167, (e) 1351, (f) 2000.

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