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In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy

1
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
2
Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11790, USA
3
School of Computing and Engineering, University of Huddersfield, Huddersfield HD1 3DH, UK
*
Author to whom correspondence should be addressed.
Materials 2020, 13(3), 794; https://doi.org/10.3390/ma13030794
Received: 3 December 2019 / Revised: 1 February 2020 / Accepted: 3 February 2020 / Published: 10 February 2020
(This article belongs to the Special Issue Radiation Damage in Materials: Helium Effects)
The use of ultrafine and nanocrystalline materials is a proposed pathway to mitigate irradiation damage in nuclear fusion components. Here, we examine the radiation tolerance of helium bubble formation in 85 nm (average grain size) nanocrystalline-equiaxed-grained tungsten and an ultrafine tungsten-TiC alloy under extreme low energy helium implantation at 1223 K via in-situ transmission electron microscope (TEM). Helium bubble damage evolution in terms of number density, size, and total volume contribution to grain matrices has been determined as a function of He+ implantation fluence. The outputs were compared to previously published results on severe plastically deformed (SPD) tungsten implanted under the same conditions. Large helium bubbles were formed on the grain boundaries and helium bubble damage evolution profiles are shown to differ among the different materials with less overall damage in the nanocrystalline tungsten. Compared to previous works, the results in this work indicate that the nanocrystalline tungsten should possess a fuzz formation threshold more than one order of magnitude higher than coarse-grained tungsten. View Full-Text
Keywords: nanocrystalline tungsten; alloy; in-situ electron microscopy; helium bubbles; radiation tolerance nanocrystalline tungsten; alloy; in-situ electron microscopy; helium bubbles; radiation tolerance
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El Atwani, O.; Unal, K.; Cunningham, W.S.; Fensin, S.; Hinks, J.; Greaves, G.; Maloy, S. In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy. Materials 2020, 13, 794.

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