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|Title: ||Irradiation behaviour of α2 and γ phases in He ion implanted titanium aluminide alloy|
|Authors: ||Zhua, H|
|Issue Date: ||1-Jul-2014|
|Citation: ||Zhu, H., Wei, T., Blackford, M., Short, K., Carr, D., Harrison, R., . . . Maruyama, K. (2014). Irradiation behaviour of α2 and γ phases in He ion implanted titanium aluminide alloy. Intermetallics, 50(0), 28-33. doi: http://dx.doi.org/10.1016/j.intermet.2014.02.005|
|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.|
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