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

Abstract

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.

Authors:
; ; ; ; ; ; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1598747
Grant/Contract Number:  
20160674PRD3
Resource Type:
Published Article
Journal Name:
Materials
Additional Journal Information:
Journal Name: Materials Journal Volume: 13 Journal Issue: 3; Journal ID: ISSN 1996-1944
Publisher:
MDPI AG
Country of Publication:
Switzerland
Language:
English

Citation Formats

El Atwani, Osman, Unal, Kaan, Cunningham, William Streit, Fensin, Saryu, Hinks, Jonathan, Greaves, Graeme, and Maloy, Stuart. In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy. Switzerland: N. p., 2020. Web. doi:10.3390/ma13030794.
El Atwani, Osman, Unal, Kaan, Cunningham, William Streit, Fensin, Saryu, Hinks, Jonathan, Greaves, Graeme, & Maloy, Stuart. In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy. Switzerland. doi:10.3390/ma13030794.
El Atwani, Osman, Unal, Kaan, Cunningham, William Streit, Fensin, Saryu, Hinks, Jonathan, Greaves, Graeme, and Maloy, Stuart. Mon . "In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy". Switzerland. doi:10.3390/ma13030794.
@article{osti_1598747,
title = {In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy},
author = {El Atwani, Osman and Unal, Kaan and Cunningham, William Streit and Fensin, Saryu and Hinks, Jonathan and Greaves, Graeme and Maloy, Stuart},
abstractNote = {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.},
doi = {10.3390/ma13030794},
journal = {Materials},
number = 3,
volume = 13,
place = {Switzerland},
year = {2020},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.3390/ma13030794

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