In-Situ Helium Implantation and TEM Investigation of Radiation Tolerance to Helium Bubble Damage in Equiaxed Nanocrystalline Tungsten and Ultrafine Tungsten-TiC Alloy
| Autor: | Jonathan A. Hinks, Graeme Greaves, Osman El Atwani, William Streit Cunningham, Kaan Unal, Stuart A. Maloy, Saryu Fensin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Equiaxed crystals
Materials science chemistry.chemical_element 02 engineering and technology Tungsten lcsh:Technology 01 natural sciences alloy 0103 physical sciences General Materials Science in-situ electron microscopy Irradiation Composite material lcsh:Microscopy Helium lcsh:QC120-168.85 010302 applied physics lcsh:QH201-278.5 lcsh:T Communication nanocrystalline tungsten radiation tolerance 021001 nanoscience & nanotechnology Nanocrystalline material Grain size helium bubbles chemistry lcsh:TA1-2040 lcsh:Descriptive and experimental mechanics Grain boundary lcsh:Electrical engineering. Electronics. Nuclear engineering Liquid bubble lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:TK1-9971 |
| Zdroj: | Materials Materials, Vol 13, Iss 3, p 794 (2020) |
| ISSN: | 1996-1944 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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