발간논문

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Vol.27, No.4, 389 ~ 396, 1989
Title
Deformation characteristics of a Superplastic 7475 al Alloy
신동혁Dong Hyuk Shin, 김기석Ki Suk Kim, 맹선재Sun Chae Maeng
Abstract
A thermomechanical process was developed which gives a fine grain size of 8㎛ in 7475 Al alloy. Tensile and superplastic properties of this material were evaluated in the temperature range of 673-818 K over the strain-rate range of 2.8×10^(-4)-2.8×10^(-2) s^(-1). The maximum ductility exhibited by the alloy was approximately 1300%, and optimum su-perplastic properties were achieved at a strain rate which is higher by an order of mag-nitude than other 7475 Al alloys. This result is attributed to the presence of fine diaper-soils which maintain the fine grain size at high homologous temperatures. The superplastic 7475 Al alloy has strain rate sensitivity of about 0.67, and an activation energy which is similar to the one for lattice diffusion of aluminum. The superplastic deformation can be explained by a diffusion accomodated grain boundary sliding model.
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