Characterization of dynamic microstructure evolution during hot deformation of Al-4.10Cu-1.42Mg-0.57Mn-0.12Zr alloy
(1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
2. Hunan Provincal Key Laboratory of Spray Deposition Technology and Application,
Hunan University, Changsha 410082, China;
3. Department of Materials Science and Engineering, McMaster University, Hamiltion, Ontario L8S 4L7, Canada)
2. Hunan Provincal Key Laboratory of Spray Deposition Technology and Application,
Hunan University, Changsha 410082, China;
3. Department of Materials Science and Engineering, McMaster University, Hamiltion, Ontario L8S 4L7, Canada)
Abstract: The Al-4.10Cu-1.42Mg-0.57Mn-0.12Zr alloy was compressed to different strains at deformation temperature of 300 oC and strain rate of 10 s-1 on Gleeble-1500 system. The dynamic complex microstructures evolutions were investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The true stress-true strain curves exhibited a peak stress at critical strain, after which the flow stresses decreased monotonically, showing a dynamic flow softening. As the strain increased, the dislocation tangled to cell structure and sub-grain structure, which indicated the occurrence of dynamic recovery during deformation. Dynamic precipitations of S (Al2CuMg), θ (Al2Cu) and Al3Zr phase were accelerated and coarsened by deformation. Continuous S phases precipitated in the Al matrix and discontinuous S phases were found to be nucleated near the Al3Zr phase and at the sub-grain boundary. The flow softening mechanism was resulted from the reduction of dislocation density which attributed to dynamic recovery and precipitates coarsening.
Key words: aluminum alloy; hot deformation; flow softening; dynamic recovery; dynamic precipitation