Abstract
High Nb-containing TiAl alloy (Ti-45Al-8.5Nb-(W, B, Y) (at%), abbreviated as TAN alloy) was brazed at 1100 °C using Ti-28Ni (wt%) eutectic brazing alloy. The typical interfacial microstructure was TAN/τ3-Al3Ti2Ni+B2/α2-Ti3Al layer/α2-Ti3Al + δ-Ti2Ni/α2-Ti3Al layer/τ3-Al3Ti2Ni + B2/TAN. The effects of holding time on interfacial microstructure and joining properties of TAN brazed joints were investigated. The results demonstrate that the diffusion of Ni from molten brazing alloy to TAN substrate plays an important role in the interfacial microstructure evolution, which results in an increase of diffusion zone and a reduction of brazed seam with the prolongation of holding time. Shear test indicates that the maximum shear strength at room temperature and high temperature (600 °C) reaches 248.6 MPa and 166.4 MPa, respectively when holding time is 15 min. Fracture analyses reveal that brittle fracture prefers to initiate and propagate in the continuous intermetallic layers during shear test.
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