New magnesium gravity casting alloys have been developed for aircraft application in the framework of the IDEA project. The alloys are designed for sand casting, permanent mould casting and investment casting. The creep resistant alloys MRI 204 and MRI 207 are based an Mg-Zn-Zr-Nd-Y (Gd) alloying systems. Precipitation hardening and grain boundary strengthening are major mechanisms contributing to the strength of the alloys. On the other hand, solid solution and grain boundary strengthening underlying unique properties of MRI 207, which is designated for room temperature applications that require high strength, combined with increased ductility. The present paper addresses mechanical properties of newly developed sand casting alloys in comparison with commercial magnesium alloy ZE41-T5 and aluminium alloy A357-T6, which are used in same aeronautic applications. Tensile specimens configuration was in accordance with BS 2970 (Form F). The room temperature tensile properties were determined in accordance with ASTM E8M. A minimum fifteen tensile specimens of each alloy were tested and the results averaged. Fatigue specimens were machined from separately cast cylindrical bars with a 16 mm diameter. The specimens' configuration was in accordance with ASTM E466 (specimens with a continues radius between ends). All specimens were tested in T6 in conditions that were preliminarily optimised for each alloy based on numerous experiments. It was evident that new alloys significantly outperform commercial magnesium alloys and have tensile and compressive properties similar to those of aluminium alloy A357-T6. In addition, it should be noted that unique combination of strength and ductility was obtained on MRI 207-T6 alloy. One of the most important requirements to new alloys set by end user is improved fatigue behaviour. The results of first axial fatigue tests performed an the alloy MRI 205-T6 are given. It was shown that MRI 207-T6 was superior to A357-T6 in axial fatigue behaviour both at high and low stresses. The results obtained can serve as a background for further research, but more data including corrosion behaviour should be obtained.


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    Titel :

    Advanced magensium alloys for aeronautic applications


    Weitere Titelangaben:

    Hochleistungsmagnesiumlegierung für Anwendungen in der Luftfahrtindustrie


    Beteiligte:
    Bronfin, B. (Autor:in) / Bar-Yosef, O. (Autor:in) / Katsir, M. (Autor:in) / Townsend, J. (Autor:in) / Ben-Dov, A. (Autor:in) / Wendt, A. (Autor:in) / Weiß, K. (Autor:in)


    Erscheinungsdatum :

    2005


    Format / Umfang :

    7 Seiten, 2 Bilder, 2 Tabellen, 10 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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