Abstract
This work studies the formation behavior of helium bubbles in 316L stainless steel implanted with 2.5 MeV He ions at temperatures ranging from 25 to 550°C. The dose and dose rate are 2.5 × 10 21 ions/m 2 and 3.2 × 10 16 ions/m 2/s for each implantation. Bubble structures in each specimen are investigated with transmission electron microscopy. The temperature dependence of the measured number densities and mean diameters of bubble exhibits two distinctly different regimes with different apparent activation energies: the regime between 350 and 550°C with high apparent activation energies and the regime between 25 and 350°C with low apparent activation energies. The effect of the pre-implantation cold working is significant on bubble formation only in the regime between 350 and 550°C. Further analysis indicates that the regime between 350 and 550°C is controlled by He diffusion via the self-interstitial/He replacement mechanism and the regime between 25 and 350°C is controlled by He diffusion via the interstial mechanism. The results are compared with other experimental findings and show consitence with them.
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