%0 journal article
%@ 0921-5093
%A Kolb, M., Wheeler, J.M., Mathur, H.N., Neumeier, S., Korte-Kerzel, S., Pyczak, F., Michler, J., Goeken, M.

%D 2016
%J Materials Science and Engineering  A

%P 135-140 
%R doi:10.1016/j.msea.2016.04.026
%T Local mechanical properties of the (Beta0+Omega0) composite in multiphase titanium aluminides studied with nanoindentation at room and high temperatures
%U https://doi.org/10.1016/j.msea.2016.04.026
 
%X High temperature nanoindentation was conducted on a Ti‐44.5Al-6.25Nb-0.8Mo-0.1B (in at.%) alloy from room temperature up to 600 °C to determine the temperature dependence of the local mechanical properties of the individual phases in a multiphase titanium aluminide alloy. The hardness of the (β0+ω0) composite is the highest among all phases and remains constant with increasing temperature, thus the (β0+ω0) composite does not decrease the strength of the alloy even at near service temperatures. A Burgers vector analysis in TEM of the deformed volume under the residual imprints after indentation at room temperature and 600 °C showed that the plastic deformation occurs mainly by <111>-type dislocations in the β0 phase. The high hardness of the (β0+ω0) composite can be attributed to a hardening effect of ω0 precipitates.