발간논문

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Vol.28, No.8, 720 ~ 726, 1990
Title
Microstructural Aspects on the Superplastcity of 7475 Al Alloy
김기석Ki S . Kim, 신동혁Dong H . Shin, 금동화Dong W . Kum, 맹선재Sun C . Maeng
Abstract
The microstructural aspects of the superplastic behavior in 7475 Al alloy are investigated. After superplastic tests, several specimens revealed large zones free of dispersoid particles-occasionally as large as 5㎛ across. Typical micrograph depicting dispersoid-free zones (DFZ) after 100% tensile strain showed DFZ at grain boundaries lying primarily normal to the tensile stress direction. This result emphasizes the importance of diffusional flow in explaining superplastic deformation of the fine-grained 7475 A1 alloy especially at low elongations, The dissolution and growth processes of dispersoid occured at high elongations and these processes can be responsible for the formation of the dispersoid-free zone.
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