Journal of Materials Engineering and Performance

, Volume 26, Issue 4, pp 1839–1846 | Cite as

Diffusion Bonding of TA15 and Ti2AlNb Alloys: Interfacial Microstructure and Mechanical Properties



TA15 and Ti2AlNb alloys were joined by diffusion welding. The influence of holding time on morphology and mechanical properties of the joint was studied under two conditions of different bonding pressure and temperature. The interface structure was analyzed by BSE and EDS. The mechanical properties of joints were tested. The results show that the typical interfacial microstructure consists of lath α-phase (TA15 alloy)/flake α phase + α-interfacial phase + α2 phase/B2-rich phase/Ti2AlNb alloy. When bonding at 920 °C and 15 MPa with increasing holding time, the interface microstructure evolves into flake α phase and distributes as a basket-weave and the interfacial coarse spherical α phase distributes as a line. α2 phase and O phase disappear gradually while the content of the B2 phase increases. The tensile strength of the joints is 870, 892 and 903 MPa, for 120, 150 and 210 min holding time, respectively, while the elongation rises as well. When bonding at 940 °C and 10 MPa with increasing holding time, the interfacial area includes more Widmanstatten structure and B2 phase. The tensile strength of joints decreases from 921 to 908 MPa, while the elongation increases from 12 to 15.5%, for holding 120 and 210 min, respectively. The tendency of plastic fracture also increases with holding time for both temperature-pressure combinations.


diffusion bonding microstructure property TA15 alloy Ti2AlNb alloy 



This work was supported by National Natural Science Foundation of China (51175137) and New Century Excellent Talents in University (NCET-13-0765). The authors would like to thank Beibei Li, Junlin Ma and Yonggen Ding, for their support and useful discussions throughout this work.


  1. 1.
    R. Braun and C. Leyens, Protective Coatings on Orthorhombic Ti2AlNb Alloys, Mater. High Temp., 2005, 22, p 437–447CrossRefGoogle Scholar
  2. 2.
    H.Y. Wu, P.Z. Zhang, and Z. Xu, Study on Nanomechanical and High Temperature Tribological Behavior of Ti2AlNb Based Alloys by Plasma Surface Alloy, Surf. Eng., 2008, 24, p 464–469CrossRefGoogle Scholar
  3. 3.
    C.M. Li, P. Li, and M. Zhao, Microstructure and Textures of TA15 Titanium Alloy After Hot Deformation, Trans. Nonferr. Met. Soc., 2014, 24, p 91–96Google Scholar
  4. 4.
    J. Shen and A.H. Feng, Recent Advances on microstructural Controlling and Hot Forming of Ti2AlNb-Based Alloys, Acta Metall. Sin., 2013, 49, p 1286–1294CrossRefGoogle Scholar
  5. 5.
    P.E. Markovsky and S.L. Semiatin, Tailoring of Microstructure and Mechanical Properties of Ti-6Al-4V with Local Rapid (Induction) Heat Treatment, Mater. Sci. Eng. A, 2011, 528, p 3079–3089CrossRefGoogle Scholar
  6. 6.
    W.Q. Li, H.M. Wei, and P. He, Interfacial Microstructure and Mechanical Properties of Diffusion Bonding of Ti3Al and Ti2AlNb Alloys, J. Mater. Eng., 2015, 43, p 37–43CrossRefGoogle Scholar
  7. 7.
    Y.S. Liu, P. Li, and B. Wang, Numerical Simulation and Technical Study on Superplastic Forming/Diffusion Bonding for Multi-sheet Structure of Ti2AlNb Alloy, J. Mech. Eng., 2015, 51, p 43–49CrossRefGoogle Scholar
  8. 8.
    H. Zhou, H.W. Li, and J.C. Feng, Vacuum Brazing of Ti3Al-Based Alloy, Nonferr. Met., 2005, 57, p 11–14Google Scholar
  9. 9.
    S. Sam, S. Kundu, and S. Chatterjee, Diffusion Bonding of Titanium Alloy to Micro-duplex Stainless Steel Using a Nickel Alloy Interlayer: Interface Microstructure and Strength Properties, Mater. Des., 2012, 40, p 237–244CrossRefGoogle Scholar
  10. 10.
    A. Kemal, K. Yakup, and K. Nizameyyin, Experimental Study of Diffusion Welding/Bonding of Titanium to Copper, Mater. Des., 2012, 37, p 356–368CrossRefGoogle Scholar
  11. 11.
    C. Leyens and M. Peters, Titanium and Titanium Alloys, WILEY-VCH Verlag GmbH, Weinheim, 2003, p 50–78CrossRefGoogle Scholar
  12. 12.
    C.J. Boehlert, The Phase Evolution and Microstructural Stability of an Orthorhombic Ti-23Al-27Nb Alloy, J. Phase Equilib., 1999, 20, p 101–108CrossRefGoogle Scholar
  13. 13.
    W.F. Zhang, Y.H. Wang, and J.M. Ma, Heat Treatment Strengthening and Its Mechanism of Large Forging for TA15 Titanium Alloy, Chin. J. Rare Met., 2010, 34, p 1–5Google Scholar
  14. 14.
    W. Zhang, Z.K. Yao, and L.J. Tan, Influence of Isothermal Deformation Parameters on Microstructures and Properties of Welded Zone of Dissimilar Titanium Alloy, Rare Met. Mater. Eng., 2011, 40, p 1230–1233CrossRefGoogle Scholar
  15. 15.
    B.B. Li, B. Wang, and P. Li, Study on Solid Diffusion Bonding of Ti2AlNb Alloy, Trans. Nonferr. Met. Soc. China, 2015, 25, p 662–667Google Scholar
  16. 16.
    Simões Sónia, F. Viana, and A. A. Sofia Ramos, Reaction Zone Formed During Diffusion Bonding of TiNi to Ti6Al4V Using Ni/Ti Nanolayers, J. Mater. Sci., 2013, 48, p 7718–7727CrossRefGoogle Scholar
  17. 17.
    A.K. Gogia, T.K. Nandy, and D. Banerjee, Microstructure and Mechanical Properties of Orthorhombic Alloys in the Ti-Al-Nb System, Intermetallics, 1998, 6, p 741–748CrossRefGoogle Scholar
  18. 18.
    L.A. Bendersky and W.J. Boettinger, Phase transformations in the (Ti, Nb)3Al section of the Ti-Al-Nb system-II. Experimental TEM study of microstructures, Acta Metall. Mater., 1994, 42, p 2337–2352CrossRefGoogle Scholar
  19. 19.
    H. Song, Z.J. Wang, and X.D. He, Improving in Plasticity of Orthorhombic Ti2AlNb-Based Alloys Sheet by High Density Electropulsing, T. Nonferr. Met. Soc. China, 2013, 23, p 32–37CrossRefGoogle Scholar
  20. 20.
    Y. Wu, D.Z. Yang, and G.M. Song, The Formation Mechanism of the O Phase in a Ti3Al-Nb Alloy, Intermetallics, 2000, 8, p 629–632CrossRefGoogle Scholar
  21. 21.
    J.X. Dong, D. He, and M.C. Zhang, Dynamic Simulations of Element Mutual Diffusion During Hot Isostatic Pressing Diffusion Bonding, J. Univ. Sci. Technol. Beijing, 2003, 25, p 36–39Google Scholar
  22. 22.
    Y.Q. Zhao, Y.N. Chen, and X.M. Zhang, Phase Transformation and Heat Treatment of Titanium Alloys, 1st ed., Central South University Press, Changsha, 2012Google Scholar

Copyright information

© ASM International 2017

Authors and Affiliations

  1. 1.School of Material Science and EngineeringHefei University of TechnologyHefeiPeople’s Republic of China

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