About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Nanostructured Materials in Extreme Environments
|
Presentation Title |
Enhanced Thermomechanical Stability of Nanolamellar Composites Containing Thick 3-dimensional Interfaces |
Author(s) |
Nathan A. Mara, Justin Y. Cheng, Zezhou Li, Shuozhi Xu, Youxing Chen, Mauricio De Leo, Jonathan Poplawsky, Nan Li, Jon Kevin Baldwin, Irene Beyerlein |
On-Site Speaker (Planned) |
Nathan A. Mara |
Abstract Scope |
2-dimensional (2-D) interfaces with distinct boundaries demarcating an abrupt discontinuity in material properties in nanolayered composites are responsible for enhanced behaviors such as strength, radiation damage tolerance, and deformability. However, 2-D interfaces have limitations with respect to deformability and toughness. 3-D interfaces are defined as heterophase interfaces that extend out-of-plane into the two crystals on either side and are chemically, crystallographically, and/or topologically divergent, in three dimensions, from both crystals they join. We focus on thermal stability (up to 500° C) and mechanical behavior of nanolayered Cu/Nb containing interfaces with 3-D character. The resulting compositional gradient gives rise to new interphase boundary structures analyzed and quantified via S/TEM and Atom Probe Tomography. Micropillar compression results show the strength of nanocomposites containing 3-D interfaces is significantly greater than those containing 2-D interfaces. We describe structural evolution mechanistically through the use of atomistic and Phase Field Dislocation Dynamics simulations. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Characterization, Thin Films and Interfaces |