| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
The Critical Microstructural Conditions for Void Nucleation During Ductile Rupture: Dislocation Structures and Vacancy Condensation |
| Author(s) |
Philip Noell, Julian E. C. Sabisch, Douglas L. Medlin, Brad L. Boyce |
| On-Site Speaker (Planned) |
Philip Noell |
| Abstract Scope |
Ductile rupture usually involves structural degradation from the nucleation and growth of voids and their coalescence into cracks. To understand the role of dislocations during void nucleation, the present study presents ex-situ cross-sectional observations of interrupted deformation experiments revealing incipient, subsurface voids in a copper material containing copper oxide inclusions. The local microstructural state was evaluated using electron backscatter diffraction, transmission electron microscopy, and transmission kikuchi diffraction. Surprisingly, before substantial growth and coalescence has occurred, the deformation process resulted in the nucleation of hundreds of nanoscale voids per cubic micrometer in the deeply deformed neck region. Analysis of multiple microscale voids suggests that dislocation boundaries facilitate the growth process. Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |