The recent development of TiAl-based alloys by the aerospace community has provided an excellent materials alternative for hot components in automotive engines. The low density combined with an elevated temperature strength similar to that of Ni-base superalloys make TiAl-based alloys very attractive for exhaust valve applications. Lighter weight valvetrain components improve performance and permit the use of lower valve spring loads which reduce noise and friction and enhance fuel economy. However, difficult fabricability and a perception that TiAl alloys are high cost, low volume aerospace materials must be overcome in order to permit consideration for use in high-volume automotive applications. This paper provides a comparison of properties for several exhaust valve alternative materials. The density of TiAl alloys is lower than Ti alloys with creep and fatigue properties equivalent to IN-751, a current high performance exhaust valve material. Valve testing results, manufacturing alternatives for TiAl-based valves, and technical issues impeding development and implementation of TiAl-based exhaust valves are also discussed.


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    Title :

    TiAl-based allloys for exhaust valve applications


    Additional title:

    Legierungen auf Titan/Aluminium-Basis für Anwendungen in Auspuffventilen


    Contributors:

    Published in:

    Publication date :

    1993


    Size :

    8 Seiten, 4 Bilder, 2 Tabellen, 20 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    TiAl-based alloys for exhaust valve applications

    Dowling,W.E. / Allison,J.E. / Swank,L.R. et al. | Automotive engineering | 1993


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    Sherman, A. M. / Allison, J. E. / Swank, L. R. et al. | SAE Technical Papers | 1993


    Surface engineering of a TiAl-based intermetallic for automotive exhaust valves

    Bryer,J.C. / Jacobs,M.H. / Univ.of Birmingham,GB | Automotive engineering | 1997


    Surface Engineering of a TiAl-based Intermetallic for Automotive Exhaust Valves

    Bryar, J. C. / Jacobs, M. H. | British Library Conference Proceedings | 1997


    Surface Engineering of a TiAl-based Intermetallic for Automotive Exhaust Valves

    Bryar, J. C. / Jacobs, M. H. | British Library Conference Proceedings | 1997