恒温圧延により微細化されたMg-Al合金,AZ91D板材の超塑性挙動

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Thin Mg-Al alloy, AZ91D sheets annealed around the temperature between 0% and 100% recrystallization have been prepared and tensed at high temperatures and with several strain-rates. Both the total elongation and strain-rate sensitivity m have been obtained and discussed. The values of total elongation have exceeded over 110% at all testing temperatures and with all strain-rates except high strain-rate at testing temperature of 573K, and the maximum total elongation of 270% has been obtained. The m values have indicated 0.5 in range of 1.0 X 10^<-4>s^<-1> to 2.5×10^<-4>s^<-1> and maintained about 0.3 up to the neighborhood of 1.O×10^<-2>s^<-1>. The activation energy required for superplastic deformation has been calculated to be about TOkJ・mol^<-1>, which is almost same of the activation energy for self-diffusional grain boundary coefficient in Mg. Therefore, the superplastic deformation of AZ91D annealed around the temperature between 0% and 100% recrystallization has been accommodated by grain boundary diffusion.
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