발간논문

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Vol.30, No.4, 454 ~ 462, 1992
Title
Thermomechanical processing and Superplastic Properties of Al - 3Cu - 2Li - 1Mg - 0.15Zr Alloy
유재은Jae Eun Yoo, 박종우Jong Woo Park, 문인기In Ge Moon
Abstract
The effect of thermomechanical processing conditions on grain refining and superplastic properties of Al-3Cu-2Li-1Mg-0.15Zr alloy was studied. A large superplastic elongation of about 1200% was obtained at high strain rate of 10^(-2)/s, ten times faster than that of previously reported values for this alloy. The attainment of such a large elongation at this faster strain rate is attributed to the formation of fine subgrains with the size ranging from 0.5㎛ to 1.0㎛, that are statically stable up to the test temperature but dynamically recrystallize into very fine grains of 6∼7㎛ in size during high temperature(530℃) tensile deformation. The statically stable subgrains are thought to be formed due to the combined thermomechanical processing of high temperature homogenization and warm rolling. The solute atoms dissolved from coarse eutectic compounds may be reprecipitated as fine particles stabilizing subgrains during a subsequent warm rolling process.
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