Abstract
The tensile tests of laser-welded Ti–22Al–25Nb alloy with a transverse joint are carried out in temperatures ranging from 850 °C to 930 °C. The result showed that 875 °C was a critical temperature. The critical temperature could determine the fracture mode of welded samples due to the microstructural differences between the fusion zone and base metal. Fracture occurred in the welded joint when deformation temperature was less than 875 °C, while it occurred in base metal in temperature range 880–930 °C. Besides, volume fraction of spherical and strip-like α2/O grains in the fusion zone decreased with increasing temperature, and long axes of the strip-like grains showed a certain angle with respect to β/B2-phase grain boundaries. These strip-like grains impeded crack nucleation and propagation to some extent.
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