Characterization of defect clusters in ion-irradiated tungsten by X-Ray diffuse scattering

JOURNAL OF NUCLEAR MATERIALS

卷:510

Article

Sun, Peihao^1,2  Wang, Yongqiang³  Frost, Mungo¹  Schoenwaelder, Christopher^1,4  Levitan, Abraham L.¹  Mo, Mianzhen¹  Chen, Zhijiang¹  Hastings, Jerome B.¹  Tynan, George R.^5,6  Glenzer, Siegfried H.¹  Heimann, Philip⁷ 

[1] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[2] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

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

[4] Friedrich Alexander Univ Erlangen Nurnberg, D-91054 Erlangen, Germany

[5] Ctr Energy Res, La Jolla, CA 92093 USA

[6] Univ Calif San Diego, Jacobs Sch Engn, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA

[7] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA

关键词: Tungsten;    Irradiation effects;    Defect clusters;    X-ray scattering;   

DOI  :  10.1016/j.jnucmat.2018.07.062

来源: Elsevier

【 摘 要 】

Defect clusters in ion-irradiated tungsten are characterized by X-ray diffuse scattering. Single crystal tungsten samples are irradiated at 300 K by 0.5-5 MeV copper ions with total doses of 0.2, 0.6, 2, and 5 displacements per atom (DPA). Analysis of the diffuse scattering intensities allows the determination of the concentration of vacancy- and interstitial-type dislocation loops as a function of loop radius for each sample. More vacancies than interstitials are observed in each sample, and the radius of the vacancy loops increases with irradiation dose. For the 0.2DPA sample the average vacancy loop radius is 10.1 +/- 3.0 angstrom with a defect density (counting all atoms in the loops) of (10.2 +/- 1.5) x 10(-4) per tungsten atom, increasing to an average loop radius of 16.1 +/- 3.1 angstrom at a density of (8.5 +/- 1.0) x 10(-4) per tungsten atom for the 5DPA sample. (C) 2018 Elsevier B.V. All rights reserved.

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