About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Nanostructured Materials in Extreme Environments
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Presentation Title |
Nanostructured Mechanical Martensites in Ni Alloys: Defects and Ordering Effects |
Author(s) |
Janelle P. Wharry, Caleb D Clement, Chao Yang, Daniel Hong, Yu Lu, Sheng Cheng, Peter M Anderson, Donna P Guillen, David W Gandy |
On-Site Speaker (Planned) |
Janelle P. Wharry |
Abstract Scope |
This talk will explore the role of defects and chemical ordering on deformation-induced nanostructured martensite in Ni alloys. Diffusionless solid-state martensitic transformations are either stress-induced (reversible) or strain-induced (plastic). Chemical ordering and defects, such as those generated by irradiation, influence transformability and transformation mode in Ni alloys. This work combines nanoindentation experiments and molecular dynamics simulations toward understanding these influences. Work focuses on three Ni alloys, namely Alloy 625, Alloy 690, and Nitinol, which span varying degrees of chemical ordering, Ni/Fe ratios, and transformation mode (stress- versus strain-induced). Material synthesis will also be considered, with both PM-HIP and forged versions of Alloys 625 and 690. Defects are generated through ion and neutron irradiations. We will show that defects tend to suppress the extent of transformations across all alloys, by pinning the growth of nanoscale martensite needles. These results show promise for nanoscale tuning of mechanical behaviors of Ni alloys. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Mechanical Properties, Phase Transformations |