

High temperature deformation behavior of 6082AA that was over aged and pressed to 6 passes in equal channel angular die via route C was investigated. High-temperature tensile deformation was conducted in the range of 753 to 823K at four strain rates in the range of 10-2-6×10-1s-1. Stress dependence of the strain rate revealed a stress exponent, n of 7 throughout the ranges of temperatures and strain rates tested. The apparent activation energy was calculated to be 223kJmole-1. These findings implied the presence of threshold and by incorporating the threshold stress in the analysis, the true activation energy was calculated to be about 139kJmol-1. A plot of normalized strain rate (ε̇kT/DGb) vs. normalized effective stress (σ-σo)/G, on a double logarithmic scale, gave an n value of 5. Ductility increased with strain rate for all the temperature ranges and maximum ductility value of 173% was achieved at 823K for 6×10-1s-1. © 2012 Elsevier B.V.
| Compendex keywords | 6082 aluminum alloyDislocation climbECAPHigh temperature deformationThreshold stress |
|---|---|
| Engineering controlled terms: | Activation energyDeformationDuctilityEqual channel angular pressing |
| Engineering main heading: | Strain rate |
| Funding number | Funding sponsor | Acronym |
|---|---|---|
| National Plan for Science, Technology and Innovation | NPST | |
| 10-AVD1032-02 | King Saud University | KSU |
| National Plan for Science,Technology and Innovation | NPST |
This work was supported by National Plan for Science and Technology (NPST) by King Saud University through the Project no. 10-AVD1032-02.
El-Danaf, E.A.; Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh 11421, P.O. Box 800, Saudi Arabia;
© Copyright 2013 Elsevier B.V., All rights reserved.