Abstract
γ-TiAl-based alloys have been studied for decades due to their attractive properties. However, the applications are limited because of their poor formability. Electron beam melting (EBM) is advanced in fabricating components with high complexity. Studies have shown that γ-TiAl alloys can be successfully fabricated using EBM. To further explore the advantages of EBM, a bimetal component is designed: a turbine blade that containing an EBM-built Ti–48Al–2Cr–2Nb blade and a Ti–6Al–4V fir tree mount. The Ti–48Al–2Cr–2Nb side is directly built using EBM on a wrought Ti–6Al–4V substrate. Different printing strategies are applied in order to generate straight and curved diffusion interlayers. No defect is observed in both of the EBM built parts and the interlayer zones. The interlayers consist of α2-Ti3Al and B2 phases. To evaluate the reliability of the bimetal component, the tensile strength of the bimetal component is assessed. The sample with a curved interlayer exhibits a higher strength than that with a straight interlayer. The average tensile strength of the samples with curved interlayer reachs 389 MPa, which is much higher than that of the brazed TiAl/Ti–6Al–4V joints. The tensile test reveals that the fracture occurred in the interlayer zone. This work provides a promising application of γ-TiAl based alloys and a new method to form a strong bond for bimetal materials.
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