Dynamic Recrystallization Behaviors of 5083 Aluminum Alloys with Different Initial Microstructures Under Hot Compression

To study the dynamic softening behaviors of 5083 aluminum alloys with different initial microstructures under hot compression, hot compression tests of extruded and homogenized specimens were conducted at a strain rate ranging from 0.1 to 10/s and deformation temperatures ranging from 350 to 450 °C. The obtained true stress–strain curves of homogenized specimens were lower than those of extruded specimens especially at the initial deformation stage, suggesting that the effect of different initial microstructures on flow stress is significant especially at the initial deformation stage. Electron backscatter diffraction (EBSD) was used to observe the microstructure evolution process. The characteristics of continuous dynamic recrystallization, particle-stimulated recrystallization, and discontinuous dynamic recrystallization were confirmed. The experiments deformed at the same temperature and strain rate but with different strains showed the transition from continuous to discontinuous recrystallization. The recrystallization mechanism of 5083 aluminum alloys with different initial microstructures is thus finally illustrated.