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Investigation into the microstructure and mechanical properties of diffusion bonded TiAl alloys

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Abstract

TiAl alloys are potential candidates for replacing conventional Ti-alloys in gas turbine applications in the relatively lower temperature sections, owing to their low density and excellent high temperature properties. However, their intolerable ambient temperature brittleness hinders their use in such applications. Recently, TiAl alloys with some room temperature ductility were developed through alloy development programmes using special production routes such as powder metallurgy. However, the room temperature brittleness of these alloys could not be overcome.

Sound joining of these alloys is a fundamental prerequisite for their successful integration into high temperature aerospace applications. It has been well demonstrated that diffusion bonding, a commonly used joining technology in conventional Ti-alloys, can successfully be used in joining of TiAl alloys both in as-cast or special-rolled conditions. In this study, diffusion bondability of a recently developed C containing TiAl alloy with a duplex microstructure using bonding parameters in the range of commercially available equipments was studied. Microstructural investigations in the joint area of the bonds were conducted to observe the presence of any weld defect. Additionally, the mechanical behaviour of the bonds was determined by shear testing to find out the optimum bonding parameters. Furthermore, the effect of post-bond heat treatment on the mechanical properties was investigated.

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Acknowledgements

This work was carried out within the German–Turkish joint project entitled “Solid State Joining of Advanced Light Weight High Temperature Materials for Aerospace and Automobile Applications’’ financed by KFA-Jülich Reseacrh Center, Germany and Tübitak, Ankara, Turkey. The authors would like to thank both organisations for their financial support. The authors also thank Dr. F. Appel for supplying the new generation C-containing TiAl alloy, Mr. V. Ventzke for his help with SEM and Mrs. P.-M. Fischer for her help with optical microscopy.

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Authors and Affiliations

  1. Faculty of Engineering and Architecture, Mechanical Eng. Dept., Mustafa Kemal University, Tayfur Sökmen Campus, 31034, Antakya/Hatay, Turkey

    G. Çam

  2. Faculty of Engineering, Mechanical Eng. Dept., Dokuz Eylul University, Ege University Campus, 35100, Bornova/Izmir, Turkey

    G. İpekoğlu

  3. GKSS Research Center, Institute of Materials Research, Max-Planck Str., D–21502, Geesthacht, Germany

    K. -H. Bohm & M. Koçak

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  1. G. Çam
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  2. G. İpekoğlu
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  3. K. -H. Bohm
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  4. M. Koçak
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Correspondence to G. Çam.

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Çam, G., İpekoğlu, G., Bohm, K.H. et al. Investigation into the microstructure and mechanical properties of diffusion bonded TiAl alloys. J Mater Sci 41, 5273–5282 (2006). https://doi.org/10.1007/s10853-006-0292-4

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  • DOI: https://doi.org/10.1007/s10853-006-0292-4

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