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 language | English |
---|---|
Article number | 014016 |
Journal | Physica Scripta |
Volume | 2020 |
Issue number | T171 |
DOIs | |
Publication status | Published - 2020 Jan 1 |
Event | 17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019 - Eindhoven, Netherlands Duration: 2019 May 20 → 2019 May 24 |
Keywords
- Hardness
- Helium effects
- Microstructure
- Recovery
- Tungsten
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Mathematical Physics
- Condensed Matter Physics
- Physics and Astronomy(all)