Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1636171 | Transactions of Nonferrous Metals Society of China | 2014 | 9 Pages |
Abstract
The Al-4.10Cu-1.42Mg-0.57Mn-0.12Zr alloy was compressed to different strains at deformation temperature of 300 °C 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Can LIU, Hui ZHANG, Fu-lin JIANG,