Superplastic Deformation Behavior in Mg-Al Alloy, AZ91, Grain Refined by Isothermal-rolling

概要

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The isothermal rolling mill, which allows a large preform for materials having poor workability, has been developed. AZ91 alloy sheets made from Mg–9Al–1Zn tempered to a fine grain size by recrystallization have been prepared and tensioned at elevated temperatures. The maximum total elongation reached 170% and the m-value was found to be 0.5 in range of 1.0×10−4 s−1 to 2.5×10−4 s−1 except at the testing temperature of 573 K.The activation energy required for high temperature deformation has been calculated to be about 124 kJ·mol−1, which is almost equal to the self-diffusion energy of Mg for volume diffusion. Therefore, the superplastic deformation of the recrystallized AZ91 has been accompanied by a volume diffusion.
2006-05-15