The formation and Kr-ion irradiation behaviour of new microstructural features in additively manufactured titanium aluminium alloy
RIS ID
137074
Abstract
New microstructural features were found in the TiAl alloy manufactured using the gas tungsten arc welding-based additive manufacturing technology. The ion-irradiation responses of the new microstructure features were investigated in-situ via irradiation with 1 MeV Kr2+ ions at room and 873 K. Examination of the microstructure showed that the typical lamellar microstructure consisting of α2-Ti3Al and γ-TiAl phases formed α2/γ lamellar interfaces and γ/γ twin boundaries. Apart from this, the γ lamellae were also found to form γ/γ lamellar boundaries with the two γ lamellae in the same orientation or the<10-1 > //<411>orientation relationship. This is not observed in the TiAl alloys fabricated using traditional alloy fabrication methods. Kr ion-irradiation at room and elevated temperatures resulted in no significant difference in the morphologies of most radiation-induced defects in the<411>orientated γ lamellae and the<10-1>orientated γ lamellae. However, the areas of the new boundaries exhibited different damage morphologies in comparison with the traditional γ/γ twin boundaries. The formation mechanisms of the new microstructural features formed in the additive manufacturing process and their irradiation behaviour are investigated and discussed.
Publication Details
Zhu, H., Ma, Y., Wei, T., Li, H., Aughterson, R. & Lumpkin, G. (2019). The formation and Kr-ion irradiation behaviour of new microstructural features in additively manufactured titanium aluminium alloy. Additive Manufacturing, 29 100766-1-100766-12.