The Superplastic Behavior of AA7075 al Alloy Under the Impacts of the Temperature and Strain Rate

The goal of this work is to assess the effect of technology factors on superplastic deformation of AA7075 sheets. The factors considered include strain temperature T, initial strain rate ε˙, while the response is maximum superplastic elongation (δ). Firstly, the experimental follow thermomechanical regime have determined, the result obtained is microstructural features of material with fine stable and grain size (~13 µm). Subsequently, a set of experiments were conducted in superplastic conditions such as strain temperature from 470, 500, 530, 550 °C and the initial strain rates from 5 × 10−4 s−1, 10−3 s−1, 1.5 × 10−3 s−1. Finally, an assessment of the effect of process parameters was used to determine the best superplastic deformation conditions. The results indicated that the maximum superplastic elongation of 280% could be obtained at 530°C and 10−3 s−1 strain rate. This work is expected as a significant contribution to determine a reasonable technology regime for superplastic deformation of AA7075 aluminum alloy. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.