| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
|
| Presentation Title |
In-situ TEM Investigation on Pyramidal Dislocations in Magnesium |
| Author(s) |
Boyu Liu, Fei Liu, Bin Li, Jian-Feng Nie, Zhi-Wei Shan |
| On-Site Speaker (Planned) |
Boyu Liu |
| Abstract Scope |
Magnesium is the lightest structural metal with promising applications for achieving energy efficiency. However, magnesium has limited ductility, which imposes severe constraints on cost-sensitive processing and hampers its widespread applications. The ductility of magnesium is intimately related to pyramidal dislocations. Controversies abound surrounding the fundamental behavior of pyramidal dislocations, such as their ability to accommodate plastic strain and their slip pathways, causing difficulties in rationalizing the mechanical behavior and in alloy design. The present work exploits in-situ TEM mechanical testing and 3D image reconstruction to study the pyramidal dislocations in magnesium. We demonstrate that pyramidal dislocations can accommodate considerable plasticity through gliding on both pyramidal I and II planes. Our findings provide information on the mobility of pyramidal dislocations and its relationship with plasticity in pure Mg of small sizes. Our experimental strategy can be extended to understanding the dislocation behaviors in other hexagonal metals. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |