Abstract
Equal Channel Angular (ECA) pressing is a method through which intense plastic strain can be introduced into materials by simple shear. It is suggested that during ECA pressing, only simple shear deformation is introduced into the specimen. The degree of shear deformation can be well predicted by theory and is assumed to be uniform across the specimen except the top and end part. The theory had been proved to be correct by observation of ECA pressing of plasticine with a transparent plexiglass tool and by finite element modeling. However, direct observation of shear deformation had not yet been conducted in metallic materials. One difficulty in observing the shear deformation is that marks or scratches on the surface of the specimen will be erased or destroyed by severe surface deformation caused by friction. In this research, a special method is employed to eliminate the surface friction effect so that a clear shear deformation figure can be observed.
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