Extrusion of different aluminium alloys ; experimental work and modelling treatments T. Furu, D.H. Bratland, H.E. Vatne, S. Abtahi, B. Bengtsson et J. Hou J. Phys. IV France, 11 PR4 (2001) Pr4-131-Pr4-138 DOI: 10.1051/jp4:2001417