Synergistic helium and deuterium blistering in tungsten-tantalum composites

M. Dias, A. R. Mateus, N. Catarino, N. Franco, D. Nunes, J. B. Correia, P. A. Carvalho, K. Hanada, C. Sârbu, E. Alves

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Tungsten-tantalum composites with 10 and 20 at.% Ta were prepared by ball milling W powder with Ta fibers and by consolidating the milled materials with spark plasma sintering. The composites were implanted at room temperature with He+ (30 keV with a fluence 5 × 1021at/m2) and/or D+ (15 keV with a fluence 5 × 1021 at/m 2) ion beams. The materials were studied by scanning and high-resolution transmission electron microscopy, both coupled with energy dispersive X-ray spectroscopy, and by X-ray diffraction, Rutherford backscattering spectrometry and nuclear reaction analysis. The microstructure observations revealed that the milling operation resulted in severe fragmentation of the Ta fibers. Furthermore, during the consolidation process the Ta phase acted as oxygen getter and reduced the W oxide present in the original material. The surface of the tungsten-tantalum composites implanted with D+ remained essentially unaltered, while the materials implanted with He+ evidenced blisters on the Ta-rich regions. D retention in the composites increased with He+ pre-implantation.

Original languageEnglish
Pages (from-to)69-74
Number of pages6
JournalJournal of Nuclear Materials
Volume442
Issue number1-3
DOIs
Publication statusPublished - 2013

Fingerprint

Tantalum
Helium
Tungsten
Deuterium
tantalum
deuterium
tungsten
helium
composite materials
Composite materials
fluence
blisters
fibers
Nuclear reactions
Spark plasma sintering
Fibers
consolidation
Rutherford backscattering spectroscopy
Ball milling
High resolution transmission electron microscopy

Keywords

  • IRRADIATION
  • ALLOYS
  • EVOLUTION
  • HYDROGEN

Cite this

Dias, M. ; Mateus, A. R. ; Catarino, N. ; Franco, N. ; Nunes, D. ; Correia, J. B. ; Carvalho, P. A. ; Hanada, K. ; Sârbu, C. ; Alves, E. / Synergistic helium and deuterium blistering in tungsten-tantalum composites. In: Journal of Nuclear Materials. 2013 ; Vol. 442, No. 1-3. pp. 69-74.
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Synergistic helium and deuterium blistering in tungsten-tantalum composites. / Dias, M.; Mateus, A. R.; Catarino, N.; Franco, N.; Nunes, D.; Correia, J. B.; Carvalho, P. A.; Hanada, K.; Sârbu, C.; Alves, E.

In: Journal of Nuclear Materials, Vol. 442, No. 1-3, 2013, p. 69-74.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synergistic helium and deuterium blistering in tungsten-tantalum composites

AU - Dias, M.

AU - Mateus, A. R.

AU - Catarino, N.

AU - Franco, N.

AU - Nunes, D.

AU - Correia, J. B.

AU - Carvalho, P. A.

AU - Hanada, K.

AU - Sârbu, C.

AU - Alves, E.

N1 - sem pdf conforme despacho. Portuguese Science and Technology Foundation (FCT) - PTDC/CTM/100163/2008 ;PEST-OE/CTM-UI0084/2011 ; PEST-C/CTM/LA0025/2013-14 ; FCT Grant - SFRH/BPD/68663/2010.

PY - 2013

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AB - Tungsten-tantalum composites with 10 and 20 at.% Ta were prepared by ball milling W powder with Ta fibers and by consolidating the milled materials with spark plasma sintering. The composites were implanted at room temperature with He+ (30 keV with a fluence 5 × 1021at/m2) and/or D+ (15 keV with a fluence 5 × 1021 at/m 2) ion beams. The materials were studied by scanning and high-resolution transmission electron microscopy, both coupled with energy dispersive X-ray spectroscopy, and by X-ray diffraction, Rutherford backscattering spectrometry and nuclear reaction analysis. The microstructure observations revealed that the milling operation resulted in severe fragmentation of the Ta fibers. Furthermore, during the consolidation process the Ta phase acted as oxygen getter and reduced the W oxide present in the original material. The surface of the tungsten-tantalum composites implanted with D+ remained essentially unaltered, while the materials implanted with He+ evidenced blisters on the Ta-rich regions. D retention in the composites increased with He+ pre-implantation.

KW - IRRADIATION

KW - ALLOYS

KW - EVOLUTION

KW - HYDROGEN

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ER -