Effect of statistically stored dislocations in tungsten on the irradiation induced nano-hardening analyzed by different methods

JOURNAL OF NUCLEAR MATERIALS

卷:543

Article

Bonny, G.¹  Khvan, T.^1,2  Bakaeva, A.¹  Yin, C.^1,3  Dubinko, A.¹  Cabet, C.⁴  Loyer-Prost, M.⁴  Castin, N.¹  Bakaev, A.¹  Terentyev, D.¹ 

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

[2] Univ Liege, Pl 20 Aout 7, B-4000 Liege, Belgium

[3] Catholic Univ Louvain, Inst Mech Mat & Civil Engn, B-1348 Louvain La Neuve, Belgium

[4] Univ Paris Saclay, CEA, Serv Rech Met, Phys,Lab JANNUS, F-91191 Gif Sur Yvette, France

关键词: Ion irradiation;    Nanoindentation;    Tungsten;   

DOI  :  10.1016/j.jnucmat.2020.152543

来源: Elsevier

【 摘 要 】

Tungsten self-ion irradiation was performed at 800 degrees C up to 0.01-1 dpa on two different W grades with essentially different dislocation density. Nanoindentation was applied to characterize the radiation hardening in two W grades with different microstructure. Different methods to analyze the indentation curves were applied to extract the bulk equivalent radiation hardening. It was shown that depending on the applied method, different outcomes may occur. The most satisfactory procedure was established and a consistent set of parameters was found. The bulk equivalent radiation hardening was found to saturate above 0.1 dpa. The characteristic distance between irradiation induced defects acting as dislocation pinning points was found to decrease up to 0.1 dpa, and then saturate/increase with irradiation dose. No essential difference in radiation hardening was observed between the studied W grades with essentially different initial dislocation density. (C) 2020 SCK CEN, Belgian Nuclear Research Centre. Published by Elsevier B.V. All rights reserved.

【 授权许可】

Free