Abstract
The effects of Ni addition on solidification microstructure and tensile properties of Ti-48Al-2Cr-2Nb alloy were investigated using differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy-dispersive spectroscope (EDS) and transmission electron microscopy (TEM). Results show that with 3 at% Ni addition, the as-cast microstructure is mainly composed of fine lamellar colonies (~50 μm), γ grains and Ni-riched τ3 phase. After heat treatment at 1380 °C, the Ni-containing alloy is characterized by fine fully lamellar microstructure (~90 μm). The heat-treated Ni-containing specimen exhibits superior room temperature tensile properties than other specimens. The tensile properties are discussed in light of the microstructure evolution and role of Ni-riched τ3 phase.
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