The Research on Superplasticity of Two New Ti Alloys

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The superplastic tensile deformation behavior and structural evolution of two kinds of α+β titanium alloys were investigated in this paper, one is a new high strength high toughness Ti alloy with damage tolerance called TC21, and the other is a new superplastic Ti alloy so called Ti-SP2500. The results indicated that TC21 alloy has good superplasticity at the temperature from 720 to 960 and with the strain rate of 5.510-5s-1∼1.110-2s-1. On the optimal superplastic condition, the maximum elongation is over 1300%. During the superplastic tensile deformation, the dynamic recrystallization occurs in deformation zone of the specimens and the superplasticity is improved. Ti-SP2500 alloy has good superplasticity at the temperature from 720°C to 800°C and with the strain rate of 6.67 10-4s-1∼1.1110-2s-1. The maximum elongation for Ti-SP2500 alloy will exceed 2200% at 780°C with the strain rate of 5.5610-3s-1. Its superplastic deformation mechanism is controlled by grain boundary sliding, and the grain deformation and dislocation creep has the coordinating action.

Info:

Periodical:

Materials Science Forum (Volumes 551-552)

Edited by:

K.F. Zhang

Pages:

405-410

Citation:

Y. Q. Zhao et al., "The Research on Superplasticity of Two New Ti Alloys", Materials Science Forum, Vols. 551-552, pp. 405-410, 2007

Online since:

July 2007

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$38.00

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[4] Yongqing Zhao, Henglei Qu, Liang Feng, Haiying Yang, Hui Li etal: Titanium Industry Progress, Vol. 21(2004), p.22.

[5] Henglei Qu, Yonqing Zhao, A kind of high strength high toughness titanium alloy with damage tolerance, Chinese Patent Application No: 03 1 05965. 1.

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