Abstract
TiAl is brazed with Ti-Zr-Fe and Ti-Zr-Cu-Ni-Fe brazing foils at 1,323 and 1,373 K for 5 min. Ti-rich, Ti3Al, and white blocky Ti-Zr-Al-Fe phase are found in the joint brazed with Ti-Zr-Fe filler metal at 1,323 K. Ti2Al phase is formed with the improved brazing temperature. When using Ti-Zr-Cu-Ni-Fe filler metal, the joints are mainly comprised of Ti-rich, Ti3Al, and Ti2Al and white blocky Ti-Zr-Al-(Cu, Ni, Fe) phase. The joint widths and the size and amount of white blocky Ti-Zr-based phases in the center of the joints are increased when the brazing temperature is increased. And under the same brazing condition, the joint width, the size of Ti3Al and Ti-Zr-Al-(Cu, Ni, Fe) phase in the joint brazed with Ti-Zr-Cu-Ni-Fe filler metal, are larger than that of Ti-Zr-Fe filler metal. More TiAl base metal dissolved into the joint induces the wider joint and the higher concentration of element Al in the joint, which lead to form Ti2Al phase. Too large size compounds such as Ti-Zr-based phases and Ti3Al would deteriorate the joint property. A lot of these phases also might have a negative effect on the joint property.
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Tetsui T, Ono S (1999) Endurance and composition and microstructure effects on endurance of TiAl used in turbochargers. Intermetallics 7(6):689–697
Arenas MF, Acoff VL (2003) Analysis of gamma titanium aluminide welds produced by gas tungsten arc welding. Weld J 82(5):110–115
Chaturvedi MC, Richards NL, Xu Q (1997) Electron beam welding of a Ti-45Al-2Nb-2Mn +0.8 vol. % TiB2 XD alloy. Mater Sci Eng A239–240:605–612
Nakao Y, Shinozaki K, Hamada M (1991) Diffusion bonding of intermetallic compound TiAl. ISIJ Int 31(10):1260–1266
Zhou Y, Xiong HP, Chen B, Guo WL (2012) Diffusion bonding of TiAl and GH536 superalloy with Cu and Cu-Ti as interlayers. Trans Chin Weld Inst 33(2):17–20 (in Chinese)
Shiue RK, Wu SK, Chen SY (2003) Infrared brazing of TiAl using Al-based braze alloys. Intermetallics 11:661–671
Uenishi K, Sumi H, Kobayashi KF (1995) Joining of intermetallic compound TiAl by using Al filler metal. Z Metallkd 86(4):270–274
Xiong HP, Mao W, Chen B, Liu WH, Li XH (2008) Development of bonding technology of TiAl-based alloy. Aeronaut Manuf Technol No.25: pp108–112. (in Chinese)
Shiue RK, Wu SK, Chen SY (2003) Infrared brazing of TiAl intermetallic using BAg-8 braze alloy. Acta Mater 51:1991–2004
Guedes A, Pinto MP, Viera MF, Viana F (2003) The influence of the processing temperature on the microstructure of gamma-TiAl joints brazed with a Ti-15Cu-15Ni alloy. Mater Sci Forum 426–432:4159–4164
Blue CA, Blue RA, Lin RY (1995) Microstructure evolution in joining of TiAl with a liquid Ti alloy. Scr Metall Mater 32(1):127–132
Han M, Kang H, Qu P (2006) Vacuum brazing of TiAl alloy. Aeronaut Manuf Technol. No.5: pp 88–90. (in Chinese)
Chen B, Xiong HP, Mao W, Cheng YY, Ye L, Wu X (2006) Microstructure and bonding mechanism of TiAl/42CrMo steel joints using Ti-15Cu-15Ni filler metal. J Aeronaut Mater 26(3):317–318 (in Chinese)
Chen B, Xiong HP, Mao W, Cheng YY (2010) Microstructures and properties of Ti3Al/Ti3Al and Ti3Al/GH536 joints using Ti-Zr-Cu-Ni brazing filler. J Aeronaut Mater 30(5):35–38 (in Chinese)
Miedem AR, Boer FR, Boom R, Dorleijn JWF (1977) Appendix to the paper “Model predictions for the enthalpy of formation of transition metal alloys”. Calphad 1:353–359
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Doc. IIW-2506, recommended for publication by Commission XVII "Brazing, Soldering, and Diffusion Bonding."
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Ye, L., Xiong, H.P., Huai, J.F. et al. Microstructures of the TiAl joints brazed with Ti-Zr-based filler metals. Weld World 59, 201–208 (2015). https://doi.org/10.1007/s40194-014-0192-1
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DOI: https://doi.org/10.1007/s40194-014-0192-1