|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||Microstructural Evolution and Deformation Mechanisms in Segregation-Engineered Nanocrystalline Al Alloys
||Glenn Balbus, Johann Kappacher, David Sprouster, Jungho Shin, Fulin Wang, Jason Trelewicz, Daniel Kiener, Verena Maier-Kiener, Daniel Gianola
|On-Site Speaker (Planned)
The nonequilibrium nature of amorphous solids such as metallic glasses (MGs) shares intriguing commonalities with grain boundaries in nanocrystalline (NC) materials, owing largely to the multiplicity of energy states inherent to disorder. These collective qualities underpin the attractive suite of properties in both material classes. MGs, in particular, offer vast tunability that can be accessed through nonequilibrium processing, but fall short in terms of temperature stability (structurally and mechanically). NCs alloys offer a potential marriage of these attributes: GBs with a spectrum of states, offering tunability through relaxation and rejuvenation processes, and interface-aware alloy design through segregation engineering, offering thermal stability via thermodynamic or kinetic means. We show experiments on NC Al alloys that exhibit tunability in the GB state and concomitant mechanical properties, and highlight an exemplary ternary alloy that exhibits a combination of high hardness at both room and elevated temperatures, homogeneous plasticity, and emergent thermal stability.
||Aluminum, Nanotechnology, Mechanical Properties