Abstract
Laser surface remelting followed by annealing treatment was carried out on γ-TiAl based alloy, and the phenomenon of grain size refinement was observed by transmission electron (TEM). The results show that after laser surface remelting and subsequent annealing treatment, a series of changes occur in the microstructure of γ-TiAl based alloy: L (liquid phase)→α2 (dendritic structure)+γ→γ (equiaxed grain)+α2 (small α2 particles). Finally, an equiaxed, ultrafine, uniform and stable microstructure is formed.
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