%0 journal article
%@ 0925-8388
%A Song, L., Hu, X., Wang, L., Stark, A., Lazurenko, D., Lorenz, U., Lin, J., Pyczak, F., Zhang, T.

%D 2019
%J Journal of Alloys and Compounds

%P 151649 
%R doi:10.1016/j.jallcom.2019.151649
%T Microstructure evolution and enhanced creep property of a high Nb containing TiAl alloy with carbon addition
%U https://doi.org/10.1016/j.jallcom.2019.151649
 
%X The microstructure evolution and carbide precipitation in a Ti-46Al-8Nb-0.7C alloy as well as its creep properties at intermediate temperatures are investigated by high-energy X-ray diffraction and electron microscopy. The alloy with a nearly fully lamellar microstructure exhibits excellent creep resistance, which could be attributed to the good microstructural stability and strengthening effects from both P- and H-carbides. It is also found that the creep parameters have different effects on the precipitation of the carbides. The overall volume fraction of the carbides shows a positive correlation with the creep temperature and time. However, the thermal stability of P-carbides in the γ grain interior decreases at a higher creep temperature. The creep stress hardly affects the precipitation and morphology development of the P-carbides. On the contrary, a higher stress can promote the H-carbide formation at the γ/α2 interfaces via α2 lath decomposition in lamellar colonies.