Modeling of grain-boundary mediated viscoplasticity in nanocrystalline Al/a-Al2O3 laminate system
(2024) 20TH INTERNATIONAL CONFERENCE ON TEXTURES OF MATERIALS (ICOTOM 20) — Location: Metz, France (30.June.2024)
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- Authors
Kashiwar, Ankush 
- Abstract
- Finite element (FE) modeling is used to simulate the occurrence of plastic localization observed by transmission electron microscopy (nanoDIC) at the boundaries of aluminum nanocrystals inside an Al/Al2O3/Al three-layer laminate composite (with a total thickness of 300nm) that is subjected to in situ uniaxial tension. When loaded at low-strain rate (10-6 s-1), such composite exhibits huge strength (UTS>1.5 GPa) and significant ductility (in spite of the presence of a brittle metal oxide layer) [1]. The confrontation of model predictions to experimental observations indicates that both the composite tensile response and the heterogeneous strain field inside individual layers may be explained based on diffusion-controlled, rate-dependent deformation mechanisms operating in the vicinity of grain boundaries within the Al layers. The local diffusion fluxes and their contribution to the macroscopic strain are estimated as a function of the GB tilting relative to the tensile axis.
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Citations
Mortadi, S., Idrissi, H., Delannay, L., & Kashiwar, A. (2024). Modeling of grain-boundary mediated viscoplasticity in nanocrystalline Al/a-Al2O3 laminate system. 20TH INTERNATIONAL CONFERENCE ON TEXTURES OF MATERIALS (ICOTOM 20), Metz, France.