Effect of solution and aging treatment on microstructure and tensile properties of Ti-5322 alloy

doi:10.13251/j.issn.0254-6051.2020.12.005

Abstract

Abstract: Through solution and aging treatment, the microstructure and tensile properties of Ti-5322 alloy were studied. The results show that when the solution treatment temperature is below the transformation point, the primary α phase decreases with the increase of solution treatment temperature, and the volume fraction of the β phase increases. When the solution treatment temperature is above the transformation point, the primary α phase is completely dissolved into the β phase, and the higher the temperature, the coarser the grains. During the aging at 510-590 ℃, the secondary α phase plates precipitate in the β matrix, which plays a precipitation strengthening role. As the aging temperature increases, the secondary α phase grows up and its volume fraction is reduced, leading to a decrease in the strength and an increase in the plasticity of the alloy. The room temperature tensile test shows that compared with the solution treatment in β single-phase region then aging, the strength and plasticity of the alloy are more excellent after solution treatment in the α+β two-phase region and aging, so it is most suitable to select the solution treatment in the two-phase region, and the optimum process is solution at 870 ℃ for 1 h and aging at 550 ℃ for 6 h.

Key words: Ti-5322 alloy, solution treatment, aging strengthening

CLC Number:

TG146.2

Wang Andong, Zhang Luxiang, Chen Caifeng, Mao Yongquan, Ni Lei. Effect of solution and aging treatment on microstructure and tensile properties of Ti-5322 alloy[J]. Heat Treatment of Metals, 2020, 45(12): 24-28.

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