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

Materials Research Letters

O. El-Atwani¹  S. A. Maloy²  J. A. Hinks³  G. Greaves³  J. P. Allain⁴ 

[1]Drexel University

[2]Los Alamos National Laboratory

[3]University of Huddersfield

[4]University of Illinois at Urbana-Champaign

关键词: He implantation;    TEM;    bubbles;    nanocrystalline;    grain boundary;   

DOI  :  10.1080/21663831.2017.1292326

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown