Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1580644 | Materials Science and Engineering: A | 2009 | 6 Pages |
Abstract
The hot deformation behavior of an Al-5.7 wt.%Mg alloy with erbium has been investigated. Compression tests are performed in the temperature range of 300-500 °C and in the strain rate ranging from 0.001 sâ1 to 50 sâ1 up to a true strain of 0.7. The processing maps are developed at different strains and the standard kinetic analysis has been applied to evaluate the rate controlling mechanisms. The processing maps have exhibited two domains of 350-450 °C at 0.001-0.03 sâ1 and 450-500 °C at 0.01-1 sâ1, representing dynamic recovery of Al-5.7 wt.%Mg with erbium. The apparent activation energies estimated in these two domains are 180 kJ/mol and 163 kJ/mol respectively, which suggests that cross-slip of dislocation and lattice self-diffusion are the deformation mechanisms. At strain rates higher than 10 sâ1, the flow curves demonstrate flow softening behavior, and the flow instability regions reveal mixed microstructure of local deformation and dynamic recrystallization.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Meng Gang, Li Bolong, Li Hongmei, Huang Hui, Nie Zuoren,