| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Micro- and Nano-Mechanical Behavior of Materials
|
| Presentation Title |
Processing, Characterization, and Modeling of Nano-twinned Alloys: Understanding the Role that Controlling and Tuning of Microstructure has in Dislocation-twin Interactions |
| Author(s) |
Francisco Andrade Chávez, Orcun Koray Celebi, Huseyin Sehitoglu, Jessica Krogstad |
| On-Site Speaker (Planned) |
Francisco Andrade Chávez |
| Abstract Scope |
Nanotwinned metallic systems have the potential to warrant an optimum combination of high strength, ductility and cracking resistance. Dislocation-twin interactions are responsible for the remarkable properties they exhibit, but realizing the full potential requires greater control over the nature and distribution of nanotwins. Here we use a combination of magnetron sputtering and molecular statics simulations as a route to develop a fundamental understanding of the mechanisms necessary to achieve such control of the microstructure. This is done through the manipulation of sputtering parameters, alloy chemistry and substrate interfacial strain. The nickel-titanium alloy system is used as a model system to manipulate the SFE, and thereby the likelihood for twinning. Preliminary results confirm that twin density can be directly modified through alloy chemistry and that interfacial strain modulation is effective in controlling twin orientation. Precise microstructural control facilitated by this work, will enable future systematic experimental exploration of specific dislocation-twin interactions. |