Abstract
Nanocrystalline metals are considered highly radiation-resistant materials due to their large grain boundary areas. Here, the existence of a grain size threshold for enhanced irradiation resistance in high-temperature helium-irradiated nanocrystalline and ultrafine tungsten is demonstrated. Average bubble density, projected bubble area and the corresponding change in volume were measured via transmission electron microscopy and plotted as a function of grain size for two ion fluences. Nanocrystalline grains of less than 35 nm size possess ∼10–20 times lower change in volume than ultrafine grains and this is discussed in terms of the grain boundaries defect sink efficiency.
| Original language | English |
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| Pages (from-to) | 343-349 |
| Number of pages | 7 |
| Journal | Materials Research Letters |
| Volume | 5 |
| Issue number | 5 |
| Early online date | 21 Feb 2017 |
| DOIs | |
| Publication status | Published - 2017 |