발간논문

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Vol.37, No.4, 441 ~ 448, 1999
Title
Research Paper / Mechanical Working : Characteristics of Shear Deformation in the Equal Channel Angular Pressing ( ECAP )
고흥석H . S . Ko, 장준연J . Y . Chang, 최성규S . G . Choi, 문인기I . G . Moon
Abstract
The study focuses on the basic deformation mechanism of ECAP (Equal Channel Angular Pressing) which gives a large shear deformation without change in the reduction of area. A model deformation in which a plasticine is pressed through a transparent die shows a typical shear deformation in detail. ECAP was performed on a commercial pure aluminum and an Al-7%Si alloy in order to investigate the change in the microstructure after ECAP. Friction force between specimen and die acts to prevent uniform shear deformation of a specimen. ECAP significantly reduces grain size of both aluminum alloys below the order of micronmeter by giving a large shear deformation, which provides a new method for grain refinement. A drastic increase in the yield strength combined with a small increase in the strain hardening is observed in both ECA pressed aluminum alloys. The ECAP is believed to be very effective in the grain refinement.
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