Sputtering of polished EUROFER97 steel: Surface structure modification and enrichment with tungsten and tantalum

JOURNAL OF NUCLEAR MATERIALS

卷:508

Article

Strom, Petter¹  Petersson, Per¹  Parra, Rodrigo Arredondo²  Oberkofler, Martin²  Schwarz-Selinger, Thomas²  Primetzhofer, Daniel³ 

[1] KTH Royal Inst Technol, Sch Elect Engn & Comp Sci, Dept Fus Plasma Phys, SE-10044 Stockholm, Sweden

[2] Max Planck Inst Plasma Phys, D-85748 Garching, Germany

[3] Uppsala Univ, Appl Nucl Phys, Dept Phys & Astron, SE-75120 Uppsala, Sweden

关键词: EUROFER;    Sputtering;    Erosion;    ToF-MEIS;    AFM;    ToF-ERDA;   

DOI  :  10.1016/j.jnucmat.2018.05.031

来源: Elsevier

【 摘 要 】

Surface structure modification and enrichment with tungsten and tantalum were measured for polished EUROFER97 samples after exposure to a deuterium ion beam. Time-of-flight medium energy ion scattering and time-of-flight elastic recoil detection analysis were implemented for measuring atomic composition profiles. Atomic force microscopy and optical microscopy were used to investigate surface morphology. The deuterium particle fluence was varied between 10(21) D/m(2) and 10(24) D/m(2), projectile energy was 200 eV/D and exposure temperatures up to 1050 K were applied. The average fraction of tungsten plus tantalum to total metal content in the 2 nm closest to the sample surface was increased from an initial 0.0046 to 0.12 for the sample exposed to the highest fluence at room temperature. The enrichment was accompanied by an increase in surface roughness of one order of magnitude and grain dependent erosion of the material. The appearance of protrusions with heights up to approximately 40 nm after ion beam exposure at room temperature was observed on individual grains. Samples exposed to 10(23) D/m(2) at temperatures of 900 K and 1050 K displayed recrystallization and cracking while changes to the total surface fraction of tungsten and tantalum were limited to less than a factor of two compared to the sample exposed to the same fluence at room temperature. (C) 2018 The Authors. Published by Elsevier B.V. All rights reserved.

【 授权许可】

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