Hot deformation behavior of a near alpha titanium alloy with/without thermal hydrogen processing

doi:10.11890/1006-7191-102-106

Abstract

Abstract:

The true stress-true strain curves of Ti-6Al-2Zr-1Mo-1V alloy with hydrogen were obtained by hot compression test. The microstructures of the alloy before and after thermo-compression were observed. The apparent activation energies of deformation were calculated for the alloy with and without hydrogen. The behavior and mechanism of deformation for hydrogenated Ti-6Al-2Zr-1Mo-1V alloy at high temperature were analyzed. The relationship between hydrogenation time and hydrogen content at 800 ℃ can be expressed as the equation: C_H(t)=1.2-1.2exp(-t/120). The true stress-true strain curves of hot compression for Ti-6Al-2Zr-1Mo-1V alloy with hydrogen first move down and then move up as hydrogen content increases. Appropriate hydrogen content can reduce the peak of flow stress to minimal value. The apparent activation energies of deformation of the alloy with 0.47% hydrogen content and without hydrogen were calculated as 140 kJ•mol^-1 and 390,kJ•mol^-1, respectively, at 800 ℃ and at strain rate 8.3×10^-4s^-1. The apparent activation energy of deformation increases when the strain rate enhances from 8.3×10^-4s^-1 to 8.31×0^-2s^-1.

Key words: Titanium alloy, Thermal hydrogen processing, Compression at high temperature, Hot deformation behavior, Apparent activation energy of deformation, Microstructure

Qing WANG, Dongli SUN, Xiuli HAN, Weigong WANG. Hot deformation behavior of a near alpha titanium alloy with/without thermal hydrogen processing[J]. Acta Metallurgica Sinica (English Letters), 2010, 23(2): 106-112.

References

[1] Q. Hong and Z.Q. Zhang, J Aeronaut Mater 21(1) (2001) 9.
[2] Q. Hong, Z.Q. Zhang and Y.Q. Zhao, J Guangdong Non-ferrous Met 11(2) (2001) 129.
[3] H.L. Hou, Z.Q. Li, Y.J. Wang and Q. Guan, Chin J Nonferrous Met 13(3) (2003) 533.
[4] D.L. Sun, X. Han, Q. Wang, T. Wu and Z.H. Li, Aerospace Mater Technol (3) (2005) 11.
[5] D.L. Sun, Q. Wang, X. Han, T. Wu, F.H. Chen and K. Hou, Key Eng Mater 297/300 (2005) 1133.
[6] Z.H. Li, Q. Wang, D.L. Sun and L.P. Zhang, Key Eng Mater 353/358 (2007) 683.
[7] D. Eliezer, N. Eliaz, O.N. Senkov and F.H. Froes, Mater Sci Eng A 280 (2000) 220.
[8] N. Eliaz, D. Eliezer and D.L. Olson, Mater Sci Eng A 289 (2000) 41.
[9] M. Li and W. Zhang, Int J Hydrogen Energy 33 (2008) 2714.
[10] O.N. Senkov and F.H. Froes, Int J Hydrogen Energy 24 (1999) 565.
[11] M.A. Murzinova, G.A. Salishev and D.D. Afonochev, Int J Hydrogen Energy 27 (2002) 775.
[12] M. Li and Y. Lin, Int J Hydrogen Energy 32 (2007) 626.
[13] K.W. Gao and M. Nakamura, Scr Mater 43(2) (2000) 135.
[14] W.R. Kerr, Metall Trans 16A (1985) 1077.
[15] O.N. Senkov, M. Dubois and J.J. Jonas, Metall Mater Trans A 27A (1996) 3963.
[16] Y. Song, Z.X. Guo and R. Yang, Philos Mag A 82(7) (2002) 1345.
[17] Q. Wang, X. Han, Z.H. Li, T. Wu and D.L. Sun, Mater Forum 29 (2005) 318.
[18] W.D. Zeng, X.H. Hu, H.Q. Yu and Y.G. Zhou, J Mater Eng (9) (1996) 27 (in Chinese).
[19] H.Q. Chen, H.Z. Lin, L. Guo and C.X. Cao, J Mater Eng (1) (2007) 60 (in Chinese).
[20] M.Q. Li and W.F. Zhang, Int J Hydrogen Energy 33 (2008) 2714.
[21] X.L. Han, Q. Wang, D.L. Sun and H.X. Zhang, Chin J Nonferrous Met 18(3) (2008) 523 (in Chinese).
[22] X.L. Han, Q. Wang, D.L. Sun and H.X. Zhang, Scr Mater 56 (2007) 77.
[23] X.M. Cao, Z.P. Xi and Y.Q. Zhao, Hot Working Technol (1) (2005) 29.
[24] Y. Liu and T.N. Baker, Mater Sci Eng A197 (1995) 125.
[25] D.G. Robertson and H.B. Mcshane, Mater Sci Technol 14 (1998) 339.