Abstract
γ-TiAl alloy was successfully welded using pure Ti filler metal by laser. The microstructures, element distribution and phase composition of the joint were investigated by SEM, EDS and XRD, and the mechanical properties of the joints were evaluated by nanoindentation and tensile strength tests. Crack-free joints were obtained by using Ti filler metal. The weld zone mainly contained of α2-Ti3Al phase and a small amount of Ti2Al phases. The hardness values in the weld zone were higher than that of base metal (BM) due to the formation of α2-Ti3Al phase, but for the modulus values were just the reverse. The tensile strength and elongation of the joints were 288MPa and 2.19%, respectively, accounting for 74.8% and 94.0% of the BM, respectively. The joint fracture surface exhibited typical brittle fracture morphology, and Ti2Al and TiAl2 particle phases can be seen on the fracture surface.
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