Superplastic Deformation Mechanisms in Powder Metallurgically Processed Al-5Mg-2.2Mn Alloy.

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概要

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• The tensile behavior of a powder metallurgically processed Al-5mass%Mg-2.2mass%Mn alloy with a fully recrystallized fine grained structure of 3 μm in size was characterized at strain rates between 10<SUP>-4</SUP> and 2 s<SUP>-1</SUP> at temperatures from 748 to 823 K. This alloy exhibited superplasticity at high strain rates around 10<SUP>-2</SUP> s<SUP>-1</SUP>. A maximum elongation of 570 % was obtained at a constant strain rate of 6x10<SUP>-3</SUP> s<SUP>-1</SUP> at 823 K. An analysis of the threshold stress indicated that the true stress exponent is 2 for all testing temperatures and the true activation energy for superplastic flow is equal to that for lattice diffusion in aluminum. It is postulated that superplastic flow in the P/M Al-Mg-Mn alloy is controlled by a grain boundary sliding mechanism accommodated by dislocation climb or glide controlled by lattice diffusion.

• 社団法人 粉体粉末冶金協会の論文

著者

• Mabuchi Mamoru

  National Industrial Research Institute Of Nagoya

• Higashi Kenji

  College Of Engineering Department Of Metallurgy And Metallurgy And Materials Science Osaka Prefectur

• Matsumura Yasushi

  College of Engin, Dept. Mech. Sys. Engin, Uni, of Osaka Prefecture

• Tanimura Shinji

  College of Engin, Dept. Mech. Sys. Engin, Uni, of Osaka Prefecture

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