발간논문

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Vol.30, No.2, 196 ~ 203, 1992
Title
Formability of Superplastic 8090 Al - Li Alloy Sheet
박종우Jong Woo Park, 유재은Jae Eun Yoo, 문인기In Ge Moon
Abstract
A series of blow formings was performed to develop a forming limit diagram of a superplastic 8090 Al-Li alloy sheet. The forming limit showed minimum in major strains at. a plane strain state, and increased with increasing the absoulte value of minor strains. It was found that the grain size and volume fraction of cavities were samall, and they had little effect on the forming limit, while diffuse necking and localized necking had some influence. The minor effect of the cavitation was considered to be due to the back pressure and somewhat high strain rate during forming.
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