Structural defect accumulation in tungsten and tungsten-5wt.% tantalum under incremental proton damage

JOURNAL OF NUCLEAR MATERIALS

卷:501

Article

Ipatova, I.^1,2  Harrison, R. W.³  Wady, P. T.²  Shubeita, S. M.²  Terentyev, D.⁴  Donnelly, S. E.³  Jimenez-Melero, E.¹ 

[1] Univ Manchester, Sch Mat, Oxford Rd, Manchester M13 9PL, Lancs, England

[2] Univ Manchester, Dalton Cumbrian Facil, Moor Row CA24 3HA, England

[3] Univ Huddersfield, Sch Comp & Engn, Huddersfield HD1 3DH, W Yorkshire, England

[4] Nucl Mat Sci Inst, SCK CEN, Boeretang 200, B-2400 Mol, Belgium

关键词: Refractory metals;    Binary alloys;    Dislocation analysis;    Proton irradiation;    Transmission electron microscopy;   

DOI  :  10.1016/j.jnucmat.2017.11.030

来源: Elsevier

【 摘 要 】

We have performed proton irradiation of W and W-5wt.% Ta materials at 350 degrees C with a step-wise damage level increase up to 0.7 dpa and using two beam energies, namely 40 keV and 3 MeV, in order to probe the accumulation of radiation-induced lattice damage in these materials. Interstitial-type a/2 < 111 > dislocation loops are formed under irradiation, and their size increases in W-5Ta up to a loop width of 21 +/- 4 nmat 0.3 dpa, where loop saturation takes place. In contrast, the loop length in W increases progressively up to 183 +/- 50 nm at 0.7 dpa, whereas the loop width remains relatively constant at 29 +/- 7 nmat >0.3 dpa, giving rise to dislocation strings. The dislocation loops and tangles are observed in both materials examined after a 3 MeV proton irradiation at 350 degrees C. Ta doping delays the evolution of radiation-induced dislocation structures in W, and can consequently impact the hydrogen isotope retention under plasma exposure. (c) 2018 Elsevier B.V. All rights reserved.

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