2003 Volume 44 Issue 6 Pages 1198-1203
This paper investigated the optimal deformation temperature Tc, and the optimal Zener-Hollomon parameter Zc, of both as-extruded Mg–8Al and Mg–8Al–2RE alloys, to examine the capacity of these alloys for deformation. Additionally, an equation that involves the Zener-Hollomon parameter Z was derived to evaluate the flow stress of these magnesium alloys at various temperatures and strain rates and was validated using a statistical method. These alloys were prepared by melting and casting in a vacuum induction furnace, and extruded at 633 K with a reduction ratio of 90:1. Tensile tests were performed at 473 to 723 K and at strain rates ranging from 8.3×10−4 to 8.3×10−1 s−1. The implications of the experimental data were discussed in detail.