Grain size threshold for enhanced irradiation resistance in nanocrystalline and ultrafine tungsten

O. El-Atwani, J. A. Hinks, G. Greaves, J. P. Allain, S. A. Maloy
2017 Materials Research Letters  
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.
more » ... 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. IMPACT STATEMENT A grain size threshold in nanocrystalline and ultrafine tungsten has been shown to exist for enhanced irradiation-resistance performance during high-temperature helium irradiation. ARTICLE HISTORY
doi:10.1080/21663831.2017.1292326 fatcat:iebeuqy3ybfvpnhbujz5zg46pi