Superplastic deformation of an X7093 Al alloyTadić, Srdjan (Avtor) Sedmak, Aleksandar (Avtor) Prokić-Cvetković, Radica (Avtor) Eramah, Abdsalam (Avtor) Rudolf, Rebeka (Avtor) , Inštitut za kovinske materiale in tehnologije (Lastnik avtorskih pravic) superplasticityAl alloysdeformation mechanismsWe have investigated the superplastic deformation mechanism of a powder-metallurgy, high-zinc X7093 Al alloy. The objective was to examine the rate-controlling mechanisms that govern its superplastic deformation. The investigations were carried out in the temperature range 490–524 °C and strain rates of 4.17 × 10–5 s–1 to 2.1 × 10–2 s–1. The maximum ductility was slightly more than 500 % at 524 °C and 4.2 × 10–4 s–1. The values of the stress exponent (n) and the activation energy (Q) indicated that the deformation is rate-controlled by the climb within the grain-boundary diffusion path. The existence of a temperature-dependent threshold stress was confirmed.20142017-03-23 14:36:31Znanstveno delo65238sl