About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Defects and Interfaces: Modeling and Experiments
|
Presentation Title |
Linear Complexions in FCC Alloys and Their Impact on Mechanical Properties |
Author(s) |
Hannah C. Howard, W. Streit Cunningham, Divya Singh, Pulkit Garg, Edward W. Li, Benoit Merle, Timothy J. Rupert, Daniel S. Gianola |
On-Site Speaker (Planned) |
Hannah C. Howard |
Abstract Scope |
Dislocations and the microenvironments surrounding them play a key role in the plastic deformation of crystalline solids. Recently, it has been discovered that local stresses surrounding a dislocation can induce and stabilize the formation of nanoscale phases, termed linear complexions. Due to the local ordering, these linear complexions can impact plastic deformation and alter macroscale material properties, but their behavior is still not well understood. Guided by atomistic simulations, we fabricate bulk FCC Ni-Al alloys that host L12 ordering near the enriched dislocation core and employ electron microscopy to study their local structure. In agreement with computational results, spherical nanoindentation testing on regions containing linear complexions exhibit a 30% increase in max shear stress and stronger strain rate dependence when compared to samples containing no linear complexions. These methods advance understanding of the fundamental mechanisms of linear complexion formation and elucidate the connections to macroscale properties. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Phase Transformations, Modeling and Simulation |