| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2020
|
| Presentation Title |
An Investigation into the Role of Dislocation Climb During Intermediate Temperature Flow of Mg Alloys |
| Author(s) |
Michael Ritzo, Jishnu Bhattacharyya, Ricardo A Lebensohn, Sean Agnew |
| On-Site Speaker (Planned) |
Sean Agnew |
| Abstract Scope |
Textured Mg alloy samples were tensile tested at Zener-Holloman parameter values ranging from Z~50 at room temperature and 10-3 s-1 down to Z~18 at 350°C and 10-5 s-1. At high Z, the samples exhibit strong texture evolution indicative of significant prismatic slip of dislocations with <a> Burgers vectors. Correspondingly, the plastic anisotropy is high, r ~ 4. At low Z, the texture evolution is minimal and the response is nearly isotropic, r ~ 1. Previously, it has been asserted that the high ductility and low plastic anisotropy observed at low Z conditions is due to enhanced activity of non-basal slip modes, including prismatic slip of <a> dislocations and pyramidal slip of <a> and <c+a> dislocations. The present results call this understanding into question and suggest that the enhanced ductility is more closely associated with the climb of <a> dislocations. |
| Proceedings Inclusion? |
Planned: |