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- Title
Scattering Cancellation by a Monolayer Cloak in Oxide Dispersion‐Strengthened Alloys.
- Authors
Li, Yang; Liu, Chuanbao; Li, Pei; Lu, Tianxing; Chen, Cunguang; Guo, Zhimeng; Su, Yanjing; Qiao, Lijie; Zhou, Ji; Bai, Yang
- Abstract
In addition to wave‐based fields, metamaterials can manipulate diffusion fields at will, for example, the scattering cancellation of particle flow in natural materials. In this paper, a monolayer cloak is proposed to eliminate electron scattering and improve the total conductivity in commonly used aluminum‐oxide‐dispersion‐strengthened copper alloys (Cu‐Al2O3) after a multiscale model is established to theoretically explain the dependence of conductivity on scattering behavior. Intense electron scattering caused by dispersed alumina nanoinclusions dominates the drastic drop in the conductivity in the Cu‐Al2O3 system. The Drude model is expanded to a generalized form to explain the multiscale scattering regime in Cu‐Al2O3 after unifying the macro‐ and nanoscale considerations into the mesoscopic multibody scattering process of a Monte Carlo simulation. The results indicate that the conductivity is closely related to the overall electron density and relaxation time of electrons. Then, a cloak is designed based on scattering cancellation to improve the conductivity by reducing electron collisions, whose structure is simplified into a monolayer cloak by adopting an imaginary insulating layer. Both simulation and experiment confirm a substantial improvement of the total conductivity. The invisible cloaks manipulating particle flow expands the research scope of metamaterials to innovatively improve the properties of traditional materials.
- Subjects
ELECTRON relaxation time; DRUDE theory; GRANULAR flow; ELECTRON scattering; MONTE Carlo method
- Publication
Advanced Functional Materials, 2020, Vol 30, Issue 36, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202003270