| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1886034 | Radiation Physics and Chemistry | 2015 | 4 Pages |
•The main defects of low dose irradiated RAFM steels are (He, H)–V complexes.•H can decrease vacancy defects by forming H–V complexes.•H can accelerate the formation of (He, H)–V complexes.•Hardening induced by helium is obviously larger than that induced by hydrogen.•Hardening reveals the synergistic effects between He and H irradiation.
The reduced activation martensitic steel was irradiated with 250 keV He2+ to 3000 appm and 130 keV H+ to 15,000 appm alone and in sequence at 450 °C. The S–W curve obtained by the positron beam Doppler broadening spectra reveals that (He, H)–V complexes were induced by irradiation. The S parameters show that the H irradiation can decrease defects by forming H–V complexes. The He irradiation can form He–V complexes and the sequentially implanted H can accelerate the formation of (He, H)–V complexes. Hardening induced by He+H sequential irradiation is greater than that by He or H ion irradiation alone, suggesting synergistic effects of He and H on defects and hardening.
