Hot Processing Map and Dynamic Precipitation Behavior of 1460 Al–Li Alloy During Hot Deformation

• Published in: Metals and materials international 2023-06, Vol.29 (6), p.1652-1668
• Main Authors: Lu, Ding-ding, Li, Jin-feng, Guo, You-jie, Ma, Peng-cheng, Chen, Yong-lai, Zhang, Xu-hu, Zhang, Kai, Zhang, Rui-feng
• Format: Article
• Language: English
• Subjects: Alloys; Aluminum-lithium alloys; Characterization and Evaluation of Materials; Chemistry and Materials Science; Deformation; Dislocation pinning; Domains; Dynamic recrystallization; Edge dislocations; Energy dissipation; Engineering Thermodynamics; Grains; Heat and Mass Transfer; Low temperature; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Mechanical properties; Metallic Materials; Microstructure; Optimization; Process mapping; Process parameters; Processes; Recovery; Shear bands; Solid Mechanics; Strain rate
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-022-01319-0

Hot processing maps have been widely used to reveal the relationship between microstructures and final performances of Al–Li alloys after deformation. However, there are few researches on the hot processing maps of 1460 Al–Li alloy. In this paper, the safe zones were identified based on the corrected data with temperatures range from 300 to 500 °C and strain rates range from 0.001 to 10 s −1 . Then, the microstructural characteristics and corresponding dynamic softening mechanisms were systematically investigated by employing various characterization methods. The optimum domains were established at 300–500 °C/0.001–0.01 s −1 dominated by continuous dynamic recrystallization and dynamic recovery, while cracks were found when temperatures set around 450 °C with the highest power dissipation efficiency value of 55%. Flow localizations and micro-shear bands were also observed in instable domains of low temperature (