Diffusion Bonding of TA15 and Ti2AlNb Alloys: Interfacial Microstructure and Mechanical Properties
Tóm tắt
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.
Tài liệu tham khảo
R. Braun and C. Leyens, Protective Coatings on Orthorhombic Ti2AlNb Alloys, Mater. High Temp., 2005, 22, p 437–447
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 464–469
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 91–96
J. Shen and A.H. Feng, Recent Advances on microstructural Controlling and Hot Forming of Ti2AlNb-Based Alloys, Acta Metall. Sin., 2013, 49, p 1286–1294
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 3079–3089
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 37–43
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 43–49
H. Zhou, H.W. Li, and J.C. Feng, Vacuum Brazing of Ti3Al-Based Alloy, Nonferr. Met., 2005, 57, p 11–14
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 237–244
A. Kemal, K. Yakup, and K. Nizameyyin, Experimental Study of Diffusion Welding/Bonding of Titanium to Copper, Mater. Des., 2012, 37, p 356–368
C. Leyens and M. Peters, Titanium and Titanium Alloys, WILEY-VCH Verlag GmbH, Weinheim, 2003, p 50–78
C.J. Boehlert, The Phase Evolution and Microstructural Stability of an Orthorhombic Ti-23Al-27Nb Alloy, J. Phase Equilib., 1999, 20, p 101–108
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 1–5
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 1230–1233
B.B. Li, B. Wang, and P. Li, Study on Solid Diffusion Bonding of Ti2AlNb Alloy, Trans. Nonferr. Met. Soc. China, 2015, 25, p 662–667
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 7718–7727
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 741–748
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 2337–2352
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 32–37
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 629–632
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 36–39
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, 2012