About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
Presentation Title |
The Evolution of Interfacial States in Nanocrystalline Al-Ni-Ce and their Influence on Mechanical Behavior and Thermal Stability |
Author(s) |
Glenn H. Balbus, Yolita M Eggeler, Jungho Shin, Fulin Wang, Verena Maier-Kiener, Daniel Kiener, Daniel S Gianola |
On-Site Speaker (Planned) |
Glenn H. Balbus |
Abstract Scope |
Nanocrystalline metals can host many desirable properties; however, the high density of grain boundaries manifests as instabilities such as catastrophic shear localization and rapid coarsening, limiting the use of nanocrystalline metals. One strategy for improving thermal stability is through careful alloying with elements that exhibit a high tendency for grain boundary segregation, but the effects of grain boundary chemistry and energy on properties are non-trivial. Here, we report the effects of local chemistry and structure on the thermal and mechanical behavior of nanocrystalline Al-Ni-Ce characterized through indentation, ultrafast calorimetry, and in situ electron microscopy. Nanocrystalline Al-Ni-Ce alloys possess many desirable characteristics - a small grain size (< 10 nm), variety of atomic sizes, and strong propensity for elemental segregation. Our results suggest that these alloys have exceptional thermal stability (0.7 Tm) and mechanical properties (5.5 GPa Hardness), and tunable shear localization behavior due to the reconfiguration of grain boundaries. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |