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Equal Channel Angular Pressing (ECAP) is one of the discontinuous processes of Severe Plastic Deformation (SPD). A sketch of such a tool is depicted in Fig.1.
Fig.1: Sketch of an ECAP tool and materials deformation.
In principal the tool consists of two intersecting channels of the same cross section that meet at an angle 2f (see Fig.1). The geometry of this tool provides that the material is deformed by simple shear at ideal, frictionless, conditions. The cross section of the specimen remains about equal before and after a processing step, thus it is possible to subject one specimen several times to ECAP in order to reach highest degrees of plastic deformation . A circular or squared cross section of the channel provides the possibility of a materials processing at different routes that are distinguished by their different combinations of sample rotation around the channel axes between consecutive processing steps. Fig. 2 shows three different routes of materials processing by ECAP. The differently colored areas in this figure shows the base plane of the sample after different number of pressings at route A, B c and C, characterized by a rotation around the channel axes of 0°, +90 and 180° between consecutive pressings, respectively.
Fig.2: Examples of possible ECAP processing routes.
Last changes by ESI's Webadmin : 2007-11-20 15:13