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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...
The ideal positions and fibres of hexagonal close packed (hcp) crystals subjected to simple shear are explored in orientation space for the first time using the viscoplastic full constraints crystal plasticity approach with the help of an orientation persistence factor developed earlier for face-centred cubic crystals. Five ideal fibres are identified; these are named B, P, Y and C 1 –C ...
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