Effects of Aging Temperature on Microstructure and Mechanical Properties of TB15 Titanium Alloy
The effects of different aging temperatures on the microstructure and mechanical properties of TB15 titanium alloy in solid solution were investigated by scanning electron microscopy, electron backscatter scatter diffraction, X-ray diffraction and universal material testing machine. The results show that, the alloy is mainly composed of equiaxed β grains after solution in the single phase zone. After aging at lower temperature, needle-like α phase and isothermal ω phase precipitate in the matrix, and a precipitation-free zone (PFZ) appears near the β grain boundary. With the increase at aging temperature, the PFZ and ω phases disappear, α phase changes from needle-like morphology to lamellar morphology, and α phase of grain boundary Widmanstätten (αWGB) appears near the grain boundary. With the increase of aging temperature, the hardness of the alloy decreases, the tensile strength increases first and then decreases, while the elongation is on the contrary. After aging at 500℃, the tensile strength of the alloy reaches the peak of 1431.73 MPa, but the elongation is only 3.82％. When the alloy is agedat530℃,the comprehensive mechanical properties are better,the tensile strength is 1155 MPa and the elongation is 7.21％.
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