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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
被引:13
|作者:
El Atwani, Osman
[1
]
Unal, Kaan
[1
]
Cunningham, William Streit
[2
]
Fensin, Saryu
[1
]
Hinks, Jonathan
[3
]
Greaves, Graeme
[3
]
Maloy, Stuart
[1
]
机构:
[1] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA
[2] SUNY Stony Brook, Dept Mat Sci & Chem Engn, Stony Brook, NY 11790 USA
[3] Univ Huddersfield, Sch Comp & Engn, Huddersfield HD1 3DH, W Yorkshire, England
来源:
基金:
英国工程与自然科学研究理事会;
关键词:
nanocrystalline tungsten;
alloy;
in-situ electron microscopy;
helium bubbles;
radiation tolerance;
IRRADIATION RESISTANCE;
GRAIN-SIZE;
MICROSTRUCTURE;
MIGRATION;
EVOLUTION;
D O I:
10.3390/ma13030794
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
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.
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