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A relatively simple flow-line model is presented for the description of the deformation mode in equal channel angular extrusion. The plastic deformation zone (PDZ) is assumed to be fan-shaped. It is shown that the trajectory of the material flow within the PDZ has an elliptic shape. Analysis of experimental flow lines in Al deformed in 90° and 120° dies shows that the form of the flow lines is approximately...
Flow lines were analysed in aluminium alloy 6061 during equal channel angular extrusion (ECAE) in a 90° die with and without the application of back pressure during pressing. The lines appeared much more rounded when a back pressure was applied compared to the case of conventional ECAE testing. With the help of an analytic flow function, the deformation field was obtained. It is shown that back pressure...
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