Irradiation behaviour of α2 and γ phases in He ion implanted titanium aluminide alloy
No Thumbnail Available
Date
2014-07-01
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
A Ti–45Al–2Nb–2Mn + 0.8 vol.% TiB2 (at.%) alloy with fully lamellar microstructure consisting of hexagonal-close-packed (hcp) α2 and face-centred-tetragonal (fct) γ phases was irradiated by implanting helium ions to different fluences. Microstructural examination showed that helium cavities are formed in both the α2 and γ phases after He-ion irradiation. However, the helium cavities and their size change with fluence are much larger in the α2 phase than those in the γ phase, indicating that the γ phase exhibits better tolerance to the He-ion irradiation than the α2 phase. Since α2 and γ phases have different crystal structures, they possess differences in helium solubility and interstitial migration. These differences are responsible for the variation in radiation damage behaviour between the two phases. © 2014, Elsevier Ltd.
Description
Keywords
Alloys, Microstructure, Helium, Ions, Radiations
Citation
Zhu, H., Wei, T., Blackford, M., Short, K., Carr, D., Harrison, R., Edwards, L., Seo, D. & Maruyama, K. (2014). Irradiation behaviour of α2 and γ phases in He ion implanted titanium aluminide alloy. Intermetallics, 50, 28-33. doi:10.1016/j.intermet.2014.02.005