About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
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Presentation Title |
Local Solute Clustering and Partially Active Segregation at Grain Boundaries in Nanocrystalline Sterling Silver Alloys |
Author(s) |
Frederic Sansoz, Pavel Nikitin |
On-Site Speaker (Planned) |
Frederic Sansoz |
Abstract Scope |
In nanocrystalline alloys, the stabilization of nanosized grains by grain-boundary (GB) solute segregation complicates both strengthening and softening mechanisms, because there is no current understanding on the relationships between GB solute ordering and plastic deformation mechanisms at atomic scale. This talk will present our active research using hybrid MC/MD simulations and magnetron sputtering experiments that will amplify the atomic nature of solute interactions at GBs and its complex roles on GB-mediated plasticity mechanisms. We will present a systematic study of the Hall-Petch breakdown in nanocrystalline Cu-segregated Ag alloys where three concentration-dependent regimes of plasticity are investigated: (1) Classical segregation strengthening behavior at low solute contents, (2) shear band-induced softening from GB solute cluster expansion at high contents, and (3) a previously unknown, but extended plateau of maximum strengths from 4 at.% to 15 at.% Cu, which we termed as nanocrystalline Sterling silver, governed by partially active segregation from GB clustering. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, Thin Films and Interfaces |