Superplastic behavior of Mg-8.5Li-1Zn and Mg-8.5Li-3Zn alloys has been investigated. Dynamic recrystallization occurs in the Mg-Li-Zn alloys during extruding with high ratio after stir casting. Mg-8.5Li-1Zn alloy exhibits an elongation of about 400% at the high strain rate of 1.1 x 10(exp-2)S(exp-1) at 623K, while the Mg-8.5Li-3Zn alloy shows maximum elongation of more than 540%. The apparent activation energy for superplastic flow of both Mg-8.5Li-1Zn and Mg-8.5Li-3Zn alloys at 573-673 K is about 86kJ/mol and 79kJ/mol, respectively, so that the dominant deformation mechanism in Mg-Li-Zn alloys is grain boundary sliding (GBS) controlled by grain boundary diffusion.


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    Title :

    Superplasticity in Mg-Li-Zn alloys processed by high ratio extrusion


    Contributors:

    Published in:

    Publication date :

    2008


    Size :

    6 Seiten, 6 Bilder, 1 Tabelle, 24 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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