Abstract
A high Nb containing TiAl alloy was prepared from the pre-alloyed powder of Ti-45Al-8.5Nb-0.2B-0.2W-0.02Y (at%) by spark plasma sintering (SPS). Its high-temperature mechanical properties and compressive deformation behavior were investigated in a temperature range of 700 to 1050°C and a strain rate range of 0.002 to 0.2 s−1. The results show that the high-temperature mechanical properties of the high Nb containing TiAl alloy are sensitive to deformation temperature and strain rate, and the sensitivity to strain rate tends to rise with the deformation temperature increasing. The hot workability of the alloy is good at temperatures higher than 900°C, while fracture occurs at lower temperatures. The flow curves of the samples compressed at or above 900°C exhibit obvious flow softening after the peak stress. Under the deformation condition of 900–1050°C and 0.002–0.2 s−1, the interrelations of peak flow stress, strain rate, and deformation temperature follow the Arrhenius’ equation modified by a hyperbolic sine function with a stress exponent of 5.99 and an apparent activation energy of 441.2 kJ·mol−1.
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J.S. Li, T.B Zhang, H. Chang, H.C. Kou, and L. Zhou, Recent achievements and future directions of TiAl-based intermetallic compounds, Mater. China, 29(2010), No.3, p.1.
J. Tang, B. Huang, W. Liu, Y. He, K. Zhou, A. Wu, K. Peng, W. Qin, and Y. Du, A high ductility TiAl alloy made by two-step heat treatment, Mater. Res. Bull., 38(2003), No.15, p.2019.
C.P. Zhang and K.F. Zhang, Tensile behaviors of fine-grained δ-TiAl based alloys synthesized by pulse current auxiliary sintering, Mater. Sci. Eng. A, 520(2009), No.1–2, p.101.
H. Jabbar, J.P. Monchoux, F. Houdellier, M. Dollé, F.P Schimansky., F. Pyczak, M. Thomas, and A. Couret, Microstructure and mechanical properties of high niobium containing TiAl alloys elaborated by spark plasma sintering, Intermetallics, 18(2010), No.12, p.2312.
J.P. Lin, L.L. Zhao, G.Y. Li, L.Q. Zhang, X.P. Song, F. Ye, and G.L. Chen, Effect of Nb on oxidation behavior of high Nb containing TiAl alloys, Intermetallics, 19(2011), No.2, p.131.
G.L. Chen, X.J. Xu, Z.K. Teng, Y.L. Wang, and J.P. Lin, Microsegregation in high Nb containing TiAl alloy ingots beyond laboratory scale, Intermetallics, 15(2007), No.5–6, p.625.
Y.H. Wang, J.P. Lin, X.J. Xu, Y.H. He, Y.L. Wang, and G.L. Chen, Effect of fabrication process on microstructure of high Nb containing TiAl alloy, J. Alloys Compd., 458(2008), No.1–2, p.313.
M.R. Farhang, A.R. Kamali, and M. Nazrian-Samani, Effects of mechanical alloying on the characteristics of a nanocrystalline Ti-50 at%Al during hot pressing consolidation, Mater. Sci. Eng. B, 168(2010), No.1–3, p.136.
J.F. Gao, X.J. Xu, J.P. Lin, X.P. Song, Y.L. Wang, and G.L. Chen, Strain rate sensitivity of tensile properties in high Nb containing TiAl alloys, J. Univ. Sci. Technol. Beijing, 12(2005), No.6, p.535.
S.S. Li, X.K. Su, Y.F. Han, X.J. Xu, and G.L. Chen, Simulation of hot deformation of TiAl based alloy containing high Nb, Intermetallics, 13(2005), No.3–4, p.323.
X. Lu, X.B. He, B. Zhang, L. Zhang, X.H. Qu, and Z.X. Guo, Microstructure and mechanical properties of a spark plasma sintered Ti-45Al-8.5Nb-0.2W-0.2B-0.1Y alloy, Intermetallics, 17(2009), No.10, p.840.
R. Srinivasan, J.P. Singh, E. Tuval, and I. Weiss, Isothermal deformation of gamma titanium aluminide, Scripta Mater., 34(1996), No.8, p.1295.
R.H. Crawford, D.C. Anderson, and W.N. Waggenspack, Mesh rezoning of 2D isoparametric elements by invasion, Int. J. Numer. Methods Eng., 28(1989), No.3, p.523.
Y. Mishin and C. Herzing, Diffusion in the Ti-Al system, Acta Mater., 48(2000), No.3, p.589.
F. Wang, X.J. Xu, J.P. Lin, F. Ye, Y.L. Wang, X. Wang, and G.L. Chen, Hot deformability of cast high Nb containing TiAl alloy, Rare Met. Mater. Eng., 38(2009), No.6, p.1025.
W. Zhang, Y. Liu, H.Z. Li, Z. Li, H. Wang, and B. Liu, Constitutive modeling and processing map for elevated temperature flow behaviors of a powder metallurgy titanium aluminide alloy, J. Mater. Process. Technol., 209(2009), No.12–13, p.5363.
M.R. Shagiev, O.N. Senkov, G.A. Salishchev, and F.H. Froes, High temperature mechanical properties of a submicrocrystalline Ti-47Al-3Cr alloy produced by mechanical alloying and hot isostatic pressing, J. Alloys Compd., 313(2000), No.1–2, p.201.
K. P. Rao and Y.V.R.K. Prasad, Processing of a TiAl alloy by powder metallurgy and hot working, [in]_TMS 2009 138th Annual Meeting and Exhibition, Supplemental Proceedings, General Paper Selections, TMS, San Francisco, USA, 2009, p.509.
H.Y. Kim, W.H. Sohn, and S.H. Hong, High temperature deformation of Ti-(46–48)Al-2W intermetallic compounds, Mater. Sci. Eng. A, 251(1998), No.1–2, p.216.
W.J. Zhang and F. Appel, Weak-beam TEM study on planar fault energy of Al-lean TiAl-base alloys, Mater. Sci. Eng. A, 334(2002), No.1–2, p.59.
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[This work was financially supported by the National Natural Science Foundation of China (No.50974017) and the Research Fund for the Doctoral Program of Higher Education of China (No.20110006120023).]
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Lu, X., Zhao, Lh., Zhu, Lp. et al. High-temperature mechanical properties and deformation behavior of high Nb containing TiAl alloys fabricated by spark plasma sintering. Int J Miner Metall Mater 19, 354–359 (2012). https://doi.org/10.1007/s12613-012-0563-9
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DOI: https://doi.org/10.1007/s12613-012-0563-9