Flow behavior and mechanical properties of multi-pass thermomechanically processed 7075 Al-alloy

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El-Shenawy, Eman and Farahat, Ahmed I. Z. and Ragab, Adham E. and Elsayed, Ahmed and Reda, Reham (2023) Flow behavior and mechanical properties of multi-pass thermomechanically processed 7075 Al-alloy. Metals, 13 (7). 1158. ISSN 2075-4701 (https://doi.org/10.3390/met13071158)

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Abstract

Research on multi-pass hot processing of 7075 Al-alloy was rarely discussed. This study aims to design and evaluate different thermomechanical processing strategies (TMPS) to produce 3 mm-thick sheets of 7075 Al-alloy. A physical simulation was performed using the hot compression test of a Gleeble 3500 to study flow mechanisms and microstructural evolution, while an experimental investigation was carried out using a rolling mill to examine the effect of TMPS on the mechanical properties. Four hot forming strategies were designed and tested at a constant strain rate of 0.1 s−1 over a temperature range of 200–450 °C. These strategies involved applying a constant amount of deformation of 65–70% in single (SP), double (DP), triple (TP), and quadruple (QP) passes of thermomechanical processing to study the influence of multi-pass thermomechanical processing on the final mechanical properties and industrial feasibility. The microstructure analysis showed a significant refinement and more uniform distribution of precipitates with an increasing number of passes, as observed through optical micrographs and the full width at half maximum (FWHM)-position relationship of XRD data. The results indicate that QP is the optimum strategy for producing the best mechanical properties in the shortest production time.

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