Performing tensile tests on ECAE material reveals a long post-uniform elongation. In order to calculate correct true stress-true strain diagrams, three different approaches are used: measurements of the actual sample geometry, a neck evolution model proposed by Segal [V.M. Segal, S Ferrasse, F. Alford, Mater. Sci. Eng. A442 (2006) 321-326] and an inverse modelling method by finite element (FE) simulations. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.