New insights into microstructure of neutron-irradiated tungsten

Research output: Contribution to journalArticlepeer-review


  • Michael Dürrschnabel
  • Michail Klimenkov
  • U. Jäntsch
  • Michael Rieth
  • Hans-Christian Schneider
  • Dmitry Terentyev
  • KIT - Karlsruhe Institute of Technology

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The development of appropriate materials for fusion reactors that can sustain high neutron fluence at elevated temperatures remains a great challenge. Tungsten is one of the promising candidate materials for plasma-facing components of future fusion reactors, due to several favorable properties as for example a high melting point, a high sputtering resistivity, and a low coefficient of thermal expansion. The microstructural details of a tungsten sample with a 1.25 dpa (displacements per atom) damage dose after neutron irradiation at 800 °C were examined by transmission electron microscopy. Three types of radiation-induced defects were observed, analyzed and characterized: (1) voids with sizes ranging from 10 to 65 nm, (2) dislocation loops with a size of up to 10 nm and (3) W–Re–Os containing σ- and χ-type precipitates. The distribution of voids as well as the nature of the occurring dislocation loops were studied in detail. In addition, nano-chemical analyses revealed that the σ- and χ-type precipitates, which are sometimes attached to voids, are surrounded by a solid solution cloud enriched with Re. For the first time the crystallographic orientation relationship of the σ- and χ-phases to the W-matrix was specified. Furthermore, electron energy-loss spectroscopy could not unambiguously verify the presence of He within individual voids.


Original languageEnglish
Article number7572
Pages (from-to)1-17
Number of pages17
JournalScientific Reports
Publication statusPublished - 7 Apr 2021


  • Tungsten, Irradiation, Fusion, Defects

ID: 7416476