The influence of solute on irradiation damage evolution in nanocrystalline thin-films

JOURNAL OF NUCLEAR MATERIALS

卷:543

Article

Nathaniel, James E., II^1,2  Vetterick, Gregory A.¹  El-Atwani, Osman^1,3  Leff, Asher^1,4  Baldwin, Jon Kevin⁵  Baldo, Pete⁶  Kirk, Marquis A.⁶  Hattar, Khalid⁷  Taheri, Mitra L.^1,2 

[1] Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA

[2] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA

[3] Los Alamos Natl Lab, Mat Sci & Technol Div MST 8, Los Alamos, NM 87545 USA

[4] US Army, Res Lab, Adelphi, MD 20783 USA

[5] Los Alamos Natl Lab, Ctr Integrated Nanotechnol CINT, Los Alamos, NM 87545 USA

[6] Argonne Natl Lab, Intermediate Voltage Electron Microscope, Argonne, IL 60439 USA

[7] Sandia Natl Labs, Dept Radiat Solid Interact, Albuquerque, NM 87185 USA

关键词: Irradiation damage;    Nanocrystalline;    Transmission electron microscopy;    Defect density;    Solute effects;   

DOI  :  10.1016/j.jnucmat.2020.152616

来源: Elsevier

【 摘 要 】

Grain boundaries (GBs) are considered sinks where mobile defects are attracted and annihilated thereby hampering irradiation damage accumulation. Nanocrystalline (NC) metals characteristically have greater densities of GBs relative to their coarse-grained counterparts hence they are postulated to provide enhanced resistance to irradiation damage. The use of alloying as a means to impart synergistic properties such as corrosion resistance, increased toughness, or improved conductivity is well studied, yet the cooperative effects of solute addition and grain size in the nano-regime is not well understood. In this study, a combination of in situ ion irradiation, transmission electron microscopy (TEM), and automated crystal orientation mapping (ACOM) on model Ni, NiCr, Fe, and FeCr NC thin-films are used to provide experimental evidence that grain size and irradiation induced defect morphology (defect density and size) are not directly correlated due to defect agglomeration, annihilation at sinks, and saturation, while the addition of solute impedes defect mobility, altering the final damage state. (C) 2020 Published by Elsevier B.V.

【 授权许可】

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