발간논문

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Vol.37, No.12, 1584 ~ 1590, 1999
Title
Microstructure of Al Alloys Deformed through the Equal Channel Angular Pressing ( ECAP )
장준연J . Y . Chang,고흥석H . S . Ko,최성규S . G . Choi,문인기I . G . Moon
Abstract
The study is an attempt to understand the basic characteristics of ECAP(Equal Channel Angular Pressing) which gives large shear deformation without any change in the dimension of material. Microstructure comparison was performed between pure Al and Al-7 wt% Si alloys after the ECAP. Emphasis was put on the microstructural change of Al-Si alloys consisting of two phase (primary Al ＋ eutectic Si) where eutectic Si appears different shape and size depending on the modification. The pressing leads to the development of subgrain bands of Al and the fracture of unmodified eutectic Si. The eutectic Si may form dislocation tangles by acting as an obstacle to movement of dislocation, which can be proved with the location of eutectic Si on recrystallized grain boundary. It is obvious that ECAP results in a fine grain structure in Al-Si alloy without decohesion between Al matrix and eutectic Si.
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