| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Thick Amorphous Complexions Enabled by Compositional and Thermal Manipulation |
| Author(s) |
Charlette M. Grigorian, Timothy Rupert |
| On-Site Speaker (Planned) |
Charlette M. Grigorian |
| Abstract Scope |
The behavior of nanostructured materials is determined by the structure and chemistry of interfacial complexions. In particular, amorphous complexions have been found to significantly improve the thermal stability, mechanical properties, and radiation tolerance of nanocrystalline alloys. In this work, we describe efforts to increase the thickness and stability of amorphous complexions by modifying alloy composition and the cooling rate after firing. Thick amorphous complexion formation is demonstrated in nanocrystalline Cu-Zr-Hf alloys, showing that increasing the chemical complexity of the grain boundary has a positive effect. Notably, these alloys have exceptional thermal stability, retaining a fine nanostructure even after two weeks of annealing at > 95% of the melting temperature. The cooling rate was found to be particularly important for sustaining thick amorphous films in nanocrystalline alloys, allowing us to begin to develop an understanding of the important kinetic factors which must be considered during processing. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |