Fe代替V制备低成本钛合金的组织与性能

Several low-cost Ti-Al-V-Fe alloys with different composition were designed, and uniform (α+β) titanium alloy ingots were obtained by thenon-consumable vacuum arc melting and heat treatment. The microstructure and mechanical properties of low-cost titanium alloys with different Fe and V contents were investigated by means of scanning electron microscope, test machine and digital micro-hardness tester. The results indicate that absence of difference between the microstructure of titanium alloy with different composition can be observed, which are coarse columnar crystals composed of Widmannstatten and basket-net structure. With the increase of Fe and V, the yield strength and tensile strength of the alloy are also increased, where the strengthening effect of Fe is more significant than V. As Fe content increases, the reduction of elongation is increased obviously, and the higher Fe content leads to the larger lattice distortion, resulting in phase embrittlement. V can refine the microstructure of the titanium alloy, and the elongation of the titanium alloy is increased slightly as V content increases.