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.
Superplasticity in Mg-Li-Zn alloys processed by high ratio extrusion
Materials and Manufacturing Processes ; 23 , 4 ; 336-341
2008
6 Seiten, 6 Bilder, 1 Tabelle, 24 Quellen
Article (Journal)
English
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