Semi-solid forming is a relatively new process whereby an alloy with thixotropic characteristics at a temperature between solidus and liquidus is cast into a component in a mould. This technology is based on research originally carried out at MIT in the 1970s on rheological properties of semi-solid metals subjected to mechanical stirring. By not starting with a super-heated melt as in conventional liquid pressure die casting, semi-solid processing offers distinct advantages such as low cycle time, less porosity because of non-turbulent flow, improved die life and significantly better mechanical properties.The success or failure in the production of a component largely depends on the temperature uniformity and microstructural homogeneity of the semi-solid thixotropic feedstock prior to injection. This paper describes results of work related to the preparation of AZ91D feedstock by electro-magnetic stirring combined with superheat reduction, reheating of this material to the thixotropic state by induction and semi-solid die casting a number of complex box-like components. The reheating was carried out in a single induction coil programmed to provide variable power input such that a low temperature gradient and a minimal liquid metal segregation in the billet feedstock were realized. The microstructure was monitored throughout the processing to achieve the desired semi-solid microstructure for successful die casting. The optimal casting parameters (metal temperature, ram velocity and metal pressure) for die casting the box-like components are given.


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    Titel :

    Production and Die Casting of Semi-Solid Magnesium Alloy AZ91D


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Zheng, C-Q (Autor:in) / Loong, C. A. (Autor:in) / Essadiqi, E. (Autor:in) / Shehata, M. T. (Autor:in) / Kao, V. (Autor:in)

    Kongress:

    SAE 2002 World Congress & Exhibition ; 2002



    Erscheinungsdatum :

    04.03.2002




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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