Effects of Re content and fabrication process on microstructural changes and hardening in neutron irradiated tungsten

Makoto Fukuda, Takashi Tanno, Shuhei Nogami, Akira Hasegawa

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

The effects of the material fabrication process and rhenium (Re) content on the irradiation-induced changes in the microstructure and hardness of pure tungsten (W) and WRe alloys were investigated. Neutron irradiation of pure Wand WRe alloys (Re concentration 326%) was carried out in the experimental fast reactor JOYO. The irradiation conditions were 0.44 displacement per atom (dpa) at 531°C and 0.47 dpa at 583°C for pure W and WRe alloys, respectively. After irradiation, microstructural observations using a transmission electron microscope (TEM) and Vickers microhardness tests were performed. Voids and dislocation loops were observed in both pure Wand WRe alloys after irradiation. The number density of voids in pure W was higher than that in W3% Re, W5% Re and W10% Re. Only in the case of W26% Re irradiated to 0.47 dpa at 583°C were there no voids observed, but irradiation-induced fine precipitates and a few dislocation loops were observed. The irradiation hardening of pure W was greater than that of the WRe alloys. It was considered that irradiation hardening of pure W was caused mainly by the higher number density of voids. The addition of Re suppressed void formation and irradiation hardening of the WRe alloys. Irradiation hardening of W was also suppressed in hot-rolled W compared with arc-melted as-cast W.

Original languageEnglish
Pages (from-to)2145-2150
Number of pages6
JournalMaterials Transactions
Volume53
Issue number12
DOIs
Publication statusPublished - 2012

Keywords

  • Irradiation hardening
  • Microstructural development
  • Neutron irradiation
  • Tungsten
  • Tungstenrhenium alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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