%0 conference lecture (invited)
%@ 
%A Stark, A., Rackel, M., Pyczak, F.

%D 2020
%J THERMEC 2020 - 11th International Conference on Processing & Manufacturing of Advanced Materials

 

%T Lattice strain evolution during hot forming of gamma TiAl alloys studied with synchrotron X-ray radiation
%U 
 
%X We determined the diffraction elastic moduli of the different phases in the elastic region. During deformation of a ternary alloy (Ti-42Al-8,5Nb) at a temperature of 900 °C and a strain rate of 0.001 1/s plastic deformation starts in the beta-o phase at applied stress levels of 300-350 MPa followed by gamma phase at levels between 450-590 MPa. Load partitioning between differently oriented grains of the gamma and the alpha-2 phase was observed. Especially the hexagonal alpha-2 shows a pronounced difference between soft and hard orientations and at the beginning of the elastic-plastic region a significant load transfer onto the alpha-2 phase was observed.