Does sink efficiency unequivocally characterize how grain boundaries impact radiation damage?

El Atwani, Osman; Martinez Saez, Enrique; Esquivel, Erika V.; Efe, Mert; Taylor, Chase; Wang, Yongqiang; Uberuaga, Blas P.; Maloy, Stuart Andrew

doi:10.1103/PhysRevMaterials.2.113604

Does sink efficiency unequivocally characterize how grain boundaries impact radiation damage?

Journal Article · Wed Nov 21 00:00:00 EST 2018 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.2.113604· OSTI ID:1511606

^[1]; ^[1]; Esquivel, Erika V. ^[1]; Efe, Mert ^[2]; Taylor, Chase ^[3]; ^[1]; ^[1]; ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Middle East Technical Univ., Ankara (Turkey). Metallurgical and Materials Engineering
Idaho National Lab. (INL), Idaho Falls, ID (United States). Fusion Safety Program

The role of grain boundaries in limiting irradiation damage in nanocrystalline materials is often correlated with the grain boundary sink efficiency. Here, we demonstrate on a tungsten material system (which has very distinct vacancy and interstitial mobilities) that sink efficiency does not unequivocally describe how grain boundaries impact irradiation damage. Rather, it reflects a particular defect diffusion equation that can change if any of the bulk conditions change. Even when denuded zone formation does not occur and grain boundaries have zero sink efficiencies, grain boundaries still impact the performance of nanocrystalline materials under irradiation by acting as a saturable defect storage site. However, denuded zone formation can occur under a necessary requirement of extra defect recombination at the grain boundaries (which, for example, is not possible when vacancy migration does not occur). These insights provide answers to several outstanding questions regarding the sink efficiency of a grain boundary and assist in parametrizing the role of grain boundaries in limiting irradiation damage in nanocrystalline materials.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: 89233218CNA000001; SC0008875

OSTI ID:: 1511606

Alternate ID(s):: OSTI ID: 1483027

Report Number(s):: LA-UR--18-26334

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 11 Vol. 2; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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