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Title: Irradiation resistance of nanostructured interfaces in Zr–Nb metallic multilayers

Abstract

We report that irradiation resistance of metallic nanostructured multilayers is determined by the interactions between defects and phase boundaries. However, the dose-dependent interfacial morphology evolution can greatly change the nature of the defect–boundary interaction mechanisms over time. In the present study, we used atomistic models combined with a novel technique based on the accumulation of Frenkel pairs to simulate irradiation processes. We examined dose effects on defect evolutions near zirconium–niobium multilayer phase boundaries. Our simulations enabled us to categorize defect evolution mechanisms in bulk phases into progressing stages of dislocation accumulation, saturation, and coalescence. In the metallic multilayers, we observed a phase boundary absorption mechanism early on during irradiation, while at higher damage levels, the increased irradiation intermixing triggered a phase transformation in the Zr–Nb mixture. Lastly, this physical phenomenon resulted in the emission of a large quantity of small immobile dislocation loops from the phase boundaries.

Authors:
 [1];  [2];  [3]
  1. Georgia Inst. of Technology, Atlanta, GA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Georgia Inst. of Technology, Atlanta, GA (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1501629
Report Number(s):
SAND-2019-0944J
Journal ID: ISSN 0884-2914; applab; 671924
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Volume: 34; Journal Issue: 13; Journal ID: ISSN 0884-2914
Publisher:
Materials Research Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; radiation effects; simulation; composite

Citation Formats

Chen, Elton Y., Deo, Chaitanya, and Dingreville, Rémi. Irradiation resistance of nanostructured interfaces in Zr–Nb metallic multilayers. United States: N. p., 2019. Web. doi:10.1557/jmr.2019.42.
Chen, Elton Y., Deo, Chaitanya, & Dingreville, Rémi. Irradiation resistance of nanostructured interfaces in Zr–Nb metallic multilayers. United States. doi:10.1557/jmr.2019.42.
Chen, Elton Y., Deo, Chaitanya, and Dingreville, Rémi. Thu . "Irradiation resistance of nanostructured interfaces in Zr–Nb metallic multilayers". United States. doi:10.1557/jmr.2019.42.
@article{osti_1501629,
title = {Irradiation resistance of nanostructured interfaces in Zr–Nb metallic multilayers},
author = {Chen, Elton Y. and Deo, Chaitanya and Dingreville, Rémi},
abstractNote = {We report that irradiation resistance of metallic nanostructured multilayers is determined by the interactions between defects and phase boundaries. However, the dose-dependent interfacial morphology evolution can greatly change the nature of the defect–boundary interaction mechanisms over time. In the present study, we used atomistic models combined with a novel technique based on the accumulation of Frenkel pairs to simulate irradiation processes. We examined dose effects on defect evolutions near zirconium–niobium multilayer phase boundaries. Our simulations enabled us to categorize defect evolution mechanisms in bulk phases into progressing stages of dislocation accumulation, saturation, and coalescence. In the metallic multilayers, we observed a phase boundary absorption mechanism early on during irradiation, while at higher damage levels, the increased irradiation intermixing triggered a phase transformation in the Zr–Nb mixture. Lastly, this physical phenomenon resulted in the emission of a large quantity of small immobile dislocation loops from the phase boundaries.},
doi = {10.1557/jmr.2019.42},
journal = {Journal of Materials Research},
number = 13,
volume = 34,
place = {United States},
year = {2019},
month = {3}
}

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