Helium effects on recovery and recrystallization of powder metallurgically processed tungsten

Akira Hasegawa, Takeshi Miyazawa, Daichi Itou, Takaya Hattori, Kenta Yohida, Shuhei Nogami

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

To study the effects of helium (He) produced by the nuclear transmutation of 14 MeV neutron irradiation on the stability of grain microstructure of tungsten (W)-fabricated through a powder metallurgically (PM) process-high energy He and post implantation experiments were conducted. The recovery of worked structure and recrystallization behavior were examined using hardness measurement and microstructural observation. He with a concentration of 20 appm was implanted homogeneously though the specimen thickness below 100 °C. Post-implantation annealing was then conducted from 1100 °C to 1500 °C in vacuum. The hardness of the PM-W specimen increased after the He implantation, and the decrease of the hardening through the annealing was suppressed in the He-implanted specimens. Metallographic observations demonstrated that the dislocation cell structure in the grain of He-implanted PM-W was retained even after the 10 h annealing at 1500 °C. In conclusion, the 20 appm He suppressed the recovery of cell structure and recrystallization of the PM-W up to 1500 °C.

Original languageEnglish
Article number014016
JournalPhysica Scripta
Volume2020
Issue numberT171
DOIs
Publication statusPublished - 2020 Jan 1
Event17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019 - Eindhoven, Netherlands
Duration: 2019 May 202019 May 24

Keywords

  • Hardness
  • Helium effects
  • Microstructure
  • Recovery
  • Tungsten

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

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