%0 journal article
%@ 0966-9795
%A Liu, J.,Staron, P.,Riekehr, S.,Stark, A.,Schell, N.,Huber, N.,Schreyer, A.,Mueller, M.,Kashaev, N.

%D 2015
%J Intermetallics
%N 
%P 27-35 
%R doi:10.1016/j.intermet.2015.03.003
%T In situ study of phase transformations during laser-beam welding of a TiAl alloy for grain refinement and mechanical property optimization
%U https://doi.org/10.1016/j.intermet.2015.03.003
 
%X In situ time-resolved X-ray diffraction by synchrotron radiation was used to monitor the phase transformations and grain-refining processes during laser-beam welding of a γ-TiAl-based alloy. The heating rate plays an important role of grain refinement. A high heating rate suppresses solid–solid phase transformations. The superheated γ grains serve as heterogeneous nuclei for β grains on subsequent solidification and refine the lamellar colonies. At low heating rate, diffusion-based transformations are observed on heating and coarse lamellae are formed after welding. The refined lamellar colonies improve the mechanical properties.