| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Defect and Phase Transformation Pathway Engineering for Desired Microstructures
|
| Presentation Title |
Twin Boundaries Continue to Surprise Us: Understanding Type II Twin in NiTi and {1012} Twin in HCP Materials |
| Author(s) |
Ahmedsameerkhan Mohammed, Huseyin Sehitoglu |
| On-Site Speaker (Planned) |
Ahmedsameerkhan Mohammed |
| Abstract Scope |
Twin Boundaries (TBs) are possibly the simplest interfaces that have an authoritative say in both structural and functional material behavior. Despite entertaining research for nearly a century now, they continue to surprise us with exciting behavior exemplifying the richness of material phenomena. This study investigates two TBs: the Type II TB in martensitic NiTi and the {1012} TB in HCP Ti. The Type II TB is possibly the only interface to date whose experimental characterization by multiple researchers has yielded disagreeing Miller Indices. This study recasts seemingly contrasting experimental evidence as consistent evidence of an evolving capability, allowing the interface to exhibit different indicial identities. Similarly, the {1012} TB has been under debate due to its unclear atomic structure and detwinning mechanism, both crucial in deformation of light HCP metals. This study uses modern atomistic simulation tools to systematically deduce an orderly shear-shuffle mechanism which reconciles earlier propositions. |
| Proceedings Inclusion? |
Planned: |