The new generation of aircraft continues to develop in the direction of high weight reduction, long life and low cost, which greatly increases the amount of advanced composite materials and titanium alloy materials. Ti45Nb titanium alloy can be used as a connector for titanium alloys and composite materials. More and more attention- 2-50. During the "Eleventh Five-Year Plan" period in my country, the application research of T45Nb titanium alloy has been carried out, and Grade 36 Ti45Nb Titanium Wire has been determined as the main rivet material for composite material connection.
Ti45Nb titanium alloy belongs to β-type titanium alloy, which has the characteristics of high plasticity (elongation rate can reach more than 20%, section shrinkage rate can reach 60%~80%), corrosion resistance, excellent cold working performance, etc., and shear strength, tensile strength Higher than pure titanium, the deformation resistance is lower than pure titanium.
A lot of research work has been done on Ti45Nb titanium alloy abroad, the technology is relatively mature, and it was included in the AMS 4982 specification in 1974. In aerospace products, it has completely replaced the pure titanium rivet material, especially the alloy is made with Ti6A14V alloy. The bimetal rivet not only improves the shearing degree of the rivet, but also enables cold riveting. This kind of rivet with excellent comprehensive performance has been widely used in Airbus and Boeing aircraft.
(1) Processed organization. Since the processed Ti45Nb titanium alloy wire is deformed by cold drawing, there are a lot of slip bands at the grain boundary after cold drawing, and the grains are fibrous along the drawing direction.
(2) The annealed state structure. The microstructure of Ti45Nb titanium alloy wire has been recovered and recrystallized after annealing. The grains are equiaxed and the grain boundaries are clear.
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