Concentration dependence of the retarding effect on tungsten recrystallization under high-dose helium ion implantation
Recrystallization, a critical issue that weakens the strength and thermal shock resistance of tungsten-based plasma-facing material in fusion devices, is effectively retarded by helium. In this study, the retarding effect of helium on recrystallization was studied using tungsten samples implanted by...
Saved in:
| Main Authors: | , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
|
| Series: | Nuclear Fusion |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1741-4326/adbcc5 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Recrystallization, a critical issue that weakens the strength and thermal shock resistance of tungsten-based plasma-facing material in fusion devices, is effectively retarded by helium. In this study, the retarding effect of helium on recrystallization was studied using tungsten samples implanted by high-dose helium ions with doses ranging from 5 × 10 ^21 m ^−2 to 1 × 10 ^23 m ^−2 at two temperatures (room temperature and 673 K), and followed by annealing temperatures ranging from 1573 K to 2073 K. The results show that helium in all six samples exhibits retarding effect, with recrystallization beginning until 1773 K. Notably, the sample implanted at 673 K with a dose of 5 × 10 ^21 m ^−2 demonstrates the lowest recrystallization fraction of 13% at the annealing temperature of 1873 K, suggesting that the retarding effect weakens once the helium ion concentration exceeds a certain threshold. The hardness of high-dose helium ion-implanted tungsten samples exhibits distinct temperature-dependent patterns, different from the monotonic decline typically observed in previous helium-implanted tungsten samples. Additionally, the recovery of pinholes, created by the rupture of helium bubble, on {100} planes was observed to be the slowest, explained through molecular dynamics simulations. This work offers valuable insights into maintaining the retarding effect on recrystallization by tuning helium concentration in tungsten. |
|---|---|
| ISSN: | 0029-5515 |