Microstructure and texture evolution during high-temperature compression of Al-Mg-Si-Zr-Mn alloy

• Published in: Materials characterization Vol. 205; p. 113312
• Main Authors: Ghosh, Abhishek, Elasheri, Ali, Parson, Nick, Chen, X. -Grant
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.11.2023
• Subjects: Al-Mg-Si 6xxx alloy; Decline ratio map; Hot deformation; Softening mechanisms, Texture evolution; Zr and Mn addition; Hot deformation; Decline ratio map; Al-Mg-Si 6xxx alloy; Zr and Mn addition; Softening mechanisms, Texture evolution
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2023.113312

The hot deformation behavior of an Al-Mg-Si-Zr-Mn alloy was investigated by performing uniaxial compression tests over a temperature range of 400–550 °C and strain-rate range of 0.001–1 s−1. A decline ratio map was generated and divided into three different domains to understand the correlation between the flow stress behavior and various microstructural softening mechanisms. In domain I (deformed at 400–500 °C and 1 s−1), work hardening was more predominant than dynamic recovery (DRV). In domain II (deformed at 400–550 °C and 0.1–0.01 s−1), the microstructure was more homogenous than that in domain I. DRV was the main softening mechanism, with a dynamic equilibrium between DRV and work hardening. Owing to the higher deformation temperature and lower strain rate in domain III (450–550 °C and a strain rate of 0.001 s−1), the deformed structure almost completely disappeared, and a large number of dynamic recrystallized grains were formed. The microstructure was dominated by a combination of DRV and dynamic recrystallization softening mechanisms. Under these conditions, the flow stress decreased significantly with increasing strain owing to the presence of 44% dynamic recrystallized grains and slight coarsening of dispersoids. Textural analysis revealed the presence of strong Goss {011} 〈100〉, moderately Rotated Cube {001} 〈110〉, and Copper {112} 〈111〉 components in domains I and II. In contrast, Goss and S textures were moderately developed when deformation was performed in domain III. [Display omitted] •The hot deformation behavior of Al-Mg-Si alloy containing Zr and Mn was studied.•A decline ratio map with three domains was proposed based on flow stress curves.•EBSD results revealed microstructural and textural evolutions at different domains.•Correlation between flow stress behavior and various softening mechanisms was established.•The main texture during hot deformation was the Goss {011} .