Monolayer-thick TiO precipitation in V-4Cr-4Ti alloy induced by proton irradiation

SCRIPTA MATERIALIA

卷:130

Article

Impagnatiello, A.^1,2  Shubeita, S. M.²  Wady, P. T.²  Ipatova, I.^1,2  Dawson, H.¹  Barcellini, C.^1,2  Jimenez-Melero, E.^1,2 

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

[2] Univ Manchester, Dalton Cumbrian Facil, Westlakes Sci & Technol Pk, Moor Row CA24 3HA, England

关键词: Refractory metal;    Precipitation;    Lattice defects;    High-resolution electron microscopy;    Nuclear fusion reactor;   

DOI  :  10.1016/j.scriptamat.2016.12.002

来源: Elsevier

【 摘 要 】

We have characterised to atomic resolution the mono-layer thick TiO-type precipitate induced by proton irradiation in V-4Cr-4Ti alloy at a dose of 03 dpa and a temperature of 350 degrees C. Its formation coincides with the coarsening radiation-induced interstitial a/2 < 111 > dislocation loops that are already present at 300 degrees C. The dislocation network induced by prior cold work is mostly recovered at 300 C and 0.3 dpa, and is therefore expected to exert a minimal effect on the precipitate formation. This monolayer-thick precipitate constitutes an early stage in the radiation-induced aging process of V-4Cr-4Ti at low temperatures, and can potentially absorb additional light elements in reactor environments. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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