%0 journal article
%@ 0966-9795
%A Wang, L.,Lorenz, U.,Muench, M.,Stark, A.,Pyczak, F.
%D 2017
%J Intermetallics
%N 
%P 32-39 
%R doi:10.1016/j.intermet.2017.05.006
%T Influence of alloy composition and thermal history on carbide precipitation in Gamma-based TiAl alloys
%U https://doi.org/10.1016/j.intermet.2017.05.006
 
%X Carbide precipitation in TiAl alloys with different alloying element additions and thermal history was investigated by transmission electron microscopy and high energy X-ray diffraction. The results reveal that Nb addition in TiAl alloys does not increase the carbon solubility in the γ matrix significantly. With increasing carbon concentration in the alloys, a splitting of the P-type carbides takes place earlier in the course of ageing at 800 °C and the formation of H-type carbides is promoted. For a nearly single γ phase alloy Ti51Al5Nb0.5C, H-type carbides are the thermodynamically stable phase. However, with decreasing Al concentration, P-type carbides become thermodynamically stable at low carbon concentration (below 1%) in Ti45Al and Ti45Al5Nb alloys. It is feasible to achieve high thermodynamical stability of the P-type carbides in TiAl alloys through controlling alloying elements.