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The effects of Ni addition on solidification micro structure 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 micro structure is mainly composed of fine lamellar colonies(~50 μm),γ grains and Ni-ridied τ_3 phase.After heat treatment at 1380℃,the Ni-containing alloy is characterized by fine fully lamellar micro structure(~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 τ_3 phase.
The effects of Ni addition on solidification micro structure and tensile properties of Ti-48Al-2Cr-2Nb alloys were investigated using differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy-dispersive Results show that with 3 at% Ni addition, the as-cast micro structure is mainly composed of fine lamellar colonies (~ 50 μm), γ grains and Ni-ridied τ_3 phase. The heat-treated Ni-containing specimen exhibits superior room temperature tensile properties than other specimens. Tensile properties are discussed in light of the microstructure evolution and role of Ni-riched τ_3 phase.