| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale V
|
| Presentation Title |
c+a Dislocation Glide in Zirconium |
| Author(s) |
Thomas Soyez, Emmanuel Clouet, Fabien Onimus |
| On-Site Speaker (Planned) |
Thomas Soyez |
| Abstract Scope |
Zirconium is a metal with a hexagonal close-packed structure, whose plasticity is mainly controlled by glide of <a> dislocations. Nevertheless, such dislocations cannot accommodate deformation in the <c> direction, for which twinning or glide of <c+a> dislocations have to be activated. The aim of this work is to understand glide of <c+a> dislocations based on both experimental and numerical approaches.
TEM post-mortem observations have been performed on zirconium alloys strained up to 2% at 350°C. <c+a> dislocations are shown to glide in first order pyramidal planes and to align along specific orientations. TEM in-situ tensile experiments confirm this behavior and highlight the glide mechanism.
<c+a> dislocations have been then modeled at the atomic scale with molecular dynamics. Screw dislocations are gliding in pyramidal planes, in agreement with experiments. Variations of the glide mobility with the dislocation character is studied with these simulations. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |