Brazing Ti-48Al-2Nb-2Cr Alloys with Cu-Based Amorphous Alloy Filler

In this work, the Ti-48Al-2Nb-2Cr (at. %) alloy was successfully brazed using a Cu-based amorphous filler in 600 s under varied brazing temperatures. The element diffusion, microstructure, and precipitation phase of the joints are analyzed in detail, and the formation schemes are discussed. Reaction products in the joints are found as AlCuTi, Ti2Al, α-Ti, and (Ti,Zr)2(Cu,Ni). The interfacial microstructures varied subjected to the brazing temperature, while the shear strength of the joint firstly increased, and then accordingly decreased. The maximum shear strength of 266 MPa was reached under a brazing temperature of 1213 K and a holding time of 600 s. A formation mechanism was proposed to explain the shear strength variation following the width and amount of brittle compounds in the interfacial reaction layer.

[1]  Dennis M. Dimiduk,et al.  Gamma titanium aluminide alloys : an assessment within the competition of aerospace structural materials , 1999 .

[2]  Yit‐Tsong Chen,et al.  Infrared brazing of Ti50Al50 and Ti–6Al–4V using two Ti-based filler metals , 2008 .

[3]  Dongdong Zhu,et al.  Brazing ZrB2-SiC ceramics to Ti6Al4V alloy with TiCu-based amorphous filler , 2017 .

[4]  Manuel F. Vieira,et al.  Joining of TiAl to Steel by Diffusion Bonding with Ni/Ti Reactive Multilayers , 2016 .

[5]  O. Ozdemir,et al.  Hot Corrosion Behavior of Ti-48Al and Ti-48Al-2Cr Intermetallic Alloys Produced by Electric Current Activated Sintering , 2018, Metallurgical and Materials Transactions A.

[6]  C. Koo,et al.  Microstructural evolution and shear strength of brazing C103 and Ti–6Al–4V using Ti–20Cu–20Ni–20Zr (wt.%) filler metal , 2006 .

[7]  Shujie Pang,et al.  Vacuum brazing of Ti3Al-based alloy to TiAl using TiZrCuNi(Co) fillers , 2015 .

[8]  Manuel F. Vieira,et al.  Diffusion bonding of TiAl using reactive Ni/Al nanolayers and Ti and Ni foils , 2011 .

[9]  Yit‐Tsong Chen,et al.  Strong bonding of infrared brazed α2-Ti3Al and Ti–6Al–4V using Ti–Cu–Ni fillers , 2010 .

[10]  Jiandong Hu,et al.  Microstructural and mechanical properties of jointed ZrO2/Ti–6Al–4V alloy using Ti33Zr17Cu50 amorphous brazing filler , 2013 .

[11]  Thomas Gemming,et al.  Transmission electron microscopy investigation of Ti2Al precipitation in titanium aluminides during high-strain torsion , 2006 .

[12]  Rui Hu,et al.  A mixture of massive and feathery microstructures of Ti48Al2Cr2Nb alloy by high undercooled solidification , 2015 .

[13]  Hongzhi Niu,et al.  Microstructure evolution and mechanical properties of a novel beta γ-TiAl alloy , 2012 .

[14]  Li Li,et al.  Vacuum brazing of TiAl-based intermetallics with Ti–Zr–Cu–Ni–Co amorphous alloy as filler metal , 2015 .

[15]  Gang Wang,et al.  Brazing of ZrB2–SiC ceramic with amorphous CuTiNiZr filler , 2016 .

[16]  L. X. Zhang,et al.  Microstructure and mechanical properties of transparent alumina and TiAl alloy joints brazed using Ag-Cu-Ti filler metal , 2018 .

[17]  R. Shiue,et al.  Infrared brazing of TiAl using Al-based braze alloys , 2003 .

[18]  Gang Wang,et al.  Brazing of Ti2AlNb based alloy with amorphous Ti-Cu-Zr-Ni filler , 2015, Journal of Wuhan University of Technology-Mater. Sci. Ed..

[19]  M. K. Lee,et al.  Mechanical and corrosion properties of Ti–6Al–4V alloy joints brazed with a low-melting-point 62.7Zr–11.0Ti–13.2Cu–9.8Ni–3.3Be amorphous filler metal , 2013 .

[20]  Xinqi Tian,et al.  Brazing of ZrB2–SiC–C ceramic and GH99 superalloy to form reticular seam with low residual stress , 2015 .

[21]  R. Shiue,et al.  Infrared brazing of TiAl intermetallic using BAg-8 braze alloy , 2003 .

[22]  Daniele Ugues,et al.  Characterization of an Additive Manufactured TiAl Alloy—Steel Joint Produced by Electron Beam Welding , 2018, Materials.

[23]  Shyi-Kaan Wu,et al.  Infrared joining strength and interfacial microstructures of Ti–48Al–2Nb–2Cr intermetallics using Ti–15Cu–15Ni foil , 1999 .

[24]  Xinhua Wu.  Review of alloy and process development of TiAl alloys , 2006 .

[25]  Qiang Shen,et al.  Design and microstructures of Ti/TiAl/Al system functionally graded material , 2000 .

[26]  Rui Hu,et al.  Dendritic Growth and Microstructure Evolution with Different Cooling Rates in Ti48Al2Cr2Nb Alloy , 2015, Journal of Materials Engineering and Performance.

[27]  Xin Hu,et al.  Microstructure and mechanical properties of TiAl alloy joints vacuum brazed with Ti–Zr–Ni–Cu brazing powder without and with Mo additive , 2016 .

[28]  Li Li,et al.  Effects of brazing temperature and testing temperature on the microstructure and shear strength of γ-TiAl joints , 2015 .

[29]  Fritz Appel,et al.  Diffusion Bonding of γ(TiAl) Alloys: Influence of Composition, Microstructure, and Mechanical Properties , 2009 .

[30]  Xiaoguo Song,et al.  Brazing TiAl intermetallics using TiNi-V eutectic brazing alloy , 2012 .

[31]  Qiwen Qiu,et al.  Microstructure evolution and mechanical properties of Ti22Al25Nb alloy joints brazed with TiNiNb alloy , 2016 .

[32]  Gyoung-Ja Lee,et al.  Low-temperature brazing of titanium by the application of a Zr–Ti–Ni–Cu–Bebulk metallic glass (BMG) alloy as a filler , 2010 .

[33]  Jun Shen,et al.  Binary eutectic clusters and glass formation in ideal glass-forming liquids , 2006 .

[34]  Jian Cao,et al.  Effect of holding time on microstructure and mechanical properties of ZrO2/TiAl joints brazed by Ag–Cu filler metal , 2015 .

[35]  Zhihao Du,et al.  Microstructure and mechanical properties of vacuum diffusion bonding joints for γ-TiAl based alloy , 2018 .

[36]  Jian Cao,et al.  Relationship between microstructure and mechanical properties of TiAl/Ti2AlNb joint brazed using Ti-27Co eutectic filler metal , 2017 .

[37]  Dongpo Wang,et al.  Vacuum brazing of Ti2AlNb and TC4 alloys using Ti–Zr–Cu–Ni and Ti–Zr–Cu–Ni + Mo filler metals: Microstructural evolution and mechanical properties , 2018 .

[38]  Yao Zekun,et al.  Microstructure and property of the Ti-24Al-15Nb-1.5Mo/TC11 joint welded by electron beam welding , 2009 .

[39]  Zhibo Dong,et al.  Microstructure and mechanical properties of laser welded Ti–22Al–27Nb/TC4 dissimilar alloys , 2013 .

[40]  Marc Thomas,et al.  Phase transformations in TiAl based alloys , 2005 .

[41]  Yongqing Cai,et al.  Effect of brazing temperature and brazing time on the microstructure and tensile strength of TiAl-based alloy joints with Ti-Zr-Cu-Ni amorphous alloy as filler metal , 2017 .

[42]  Shengpeng Hu,et al.  Vacuum brazing high Nb-containing TiAl alloy to Ti60 alloy using Ti-28Ni eutectic brazing alloy , 2017 .

[43]  Seung Jin Yang,et al.  Investigation of α2/γ phase transformation mechanism under the interaction of dislocation with lamellar interface in primary creep of lamellar TiAl alloys , 2002 .