%0 journal article
%@ 1073-5623
%A Liu, J., Staron, P., Riekehr, S., Stark, A., Schell, N., Huber, N., Schreyer, A., Mueller, M., Kashaev, N.

%D 2016
%J Metallurgical and Materials Transactions  A
%N 12
%P 5750-5760 
%R doi:10.1007/s11661-016-3745-7
%T Phase Transformation and Residual Stress in a Laser Beam Spot-Welded TiAl-Based Alloy
%U https://doi.org/10.1007/s11661-016-3745-7
12 
%X The microstructure, chemical composition, residual stress, and lattice parameter evolution of the welding zone (WZ) and heat-affected zone (HAZ) of a laser-beam-welded TiAl-based alloy were investigated. It was found that both α2 and γ phases remain highly restrained in the WZ edge, and the stresses are relieved in the HAZ. A grain refinement mechanism is proposed, which works by heating the material to the β or α + β phase field for a short time. The lamellar colonies are refined by the Nb-enriched segregations.