Radiation-induced void formation and ordering in Ta-W alloys

Iuliia Ipatova, Paul Wady, Chiara Barcellini, Andrea Impagnatiello, Enrique Jimenez-Melero

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Abstract

We have assessed the formation and evolution of void and dislocation arrrangements in Ta, Ta-5wt.%W (Ta-5W) and Ta-10wt.%W (Ta-10W) as a function of radiation level at a temperature of 345±3C, by combining proton irradiation experiments, transmission electron microscopy and nano-hardness measurments. The damaged structure of tantalum at 0.1dpa is characterized by the presence of a/2 ⟨111⟩ interstitial dislocation loops and randomly distributed voids, whereas only dislocation loops are observed in the two alloys. Void ordering occurs in tantalum at 0.25dpa, together with the apperance of dense dislocation tangles. A further increase in damage level leads to a continuous nucleation and growth of voids, and saturation is not attained at a damage level of 1.55dpa. In contrast, the average size and number density of dislocation loops increases gradually with damage level in the two alloys, and voids only form at 1.55dpa. Tungsten delays the loop evolution and therefore the formation of radiation-induced voids.
Original languageEnglish
Pages (from-to)343-350
Number of pages8
JournalJournal of Nuclear Materials
Volume495
Early online date19 Aug 2017
DOIs
Publication statusPublished - Nov 2017

Keywords

  • refractory metals
  • void lattice
  • dislocation analysis
  • proton irradiation
  • Transmission electron microscopy (TEM)

Research Beacons, Institutes and Platforms

  • Dalton Nuclear Institute

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