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DOE OSTI · 1641728

Temperature threshold for preferential bubble formation on grain boundaries in tungsten under in-situ helium irradiation

El-Atwani, O.·Cunningham, W. S.·Perez, D.·Martinez, E.·Trelewicz, J. R.·Li, M.·Maloy, S. A.
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Abstract

Understanding a material's radiation tolerance requires examining its performance under different irradiation conditions. In this work, we investigate the radiation tolerance in terms of helium bubble damage in tungsten irradiated in-situ with 16 keV helium at 1073 K and 1223 K. Damage evolution represented by helium bubble density, size and total change in volume in the grain matrices and the grain boundaries are quantified as a function of fluence. Preferential large bubble formation and a higher change in volume on the grain boundaries occurred at 1223 K, suggesting faster migration of certain helium-vacancy complexes as confirmed by a diffusion-reaction model.

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36 MATERIALS SCIENCEElectron microscopyGrain boundariesHelium-vacancy complexesImplantationIn-situ

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El-Atwani, O., Cunningham, W. S., Perez, D., Martinez, E., Trelewicz, J. R., Li, M., Maloy, S. A.. 2020-01-27. Temperature threshold for preferential bubble formation on grain boundaries in tungsten under in-situ helium irradiation. https://doi.org/10.1016/j.scriptamat.2020.01.013

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36 MATERIALS SCIENCE↗