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  4. Topology evolution during coarsening of nanoscale metal network structures
 
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Topology evolution during coarsening of nanoscale metal network structures

Citation Link: https://doi.org/10.15480/882.2409
Publikationstyp
Journal Article
Date Issued
2019-07-31
Sprache
English
Author(s)
Li, Yong  orcid-logo
Ngo, Dinh Bao Nam  orcid-logo
Markmann, Jürgen 
Weissmüller, Jörg  
Institut
Werkstoffphysik und -technologie M-22  
TORE-DOI
10.15480/882.2409
TORE-URI
http://hdl.handle.net/11420/3385
Journal
Physical review materials  
Volume
3
Issue
7
Article Number
076001
Citation
Physical Review Materials 7 (3): 076001 (2019-07-31)
Publisher DOI
10.1103/PhysRevMaterials.3.076001
Scopus ID
2-s2.0-85070548020
Publisher
APS
Many experiments exploit curvature-driven, surface-diffusion-mediated coarsening for tuning the characteristic structure size of metal network structures made by dealloying, such as nanoporous gold. Here we study this process by kinetic Monte Carlo simulation. The initial microstructures are leveled Gaussian random fields, approximating spinodally decomposed mixtures, of different solid fraction φ. Earlier work establishes these structures as valid representations of the nanoporous gold microstructure. We find that the coarsening law for the characteristic spacing between the ligaments of the network is universal, whereas the time evolution of the characteristic ligament diameter is not. The expected time exponent 1/4 is confirmed by our simulation. Contrary to what may be expected based on continuum models, the degree of surface faceting or roughness has no apparent effect on the coarsening kinetics. In the time interval of our study, the network connectivity - as measured by a scaled density of topological genus - remains sensibly invariant for networks with φ≥0.3, consistent with previous reports of a self-similar evolution of the microstructure during coarsening. Yet, networks with lesser φ lose their connectivity on coarsening and can even undergo a percolation-to-cluster transition. This process is slow for φ only little below 0.3 and it accelerates in networks with lesser φ. The dependency of the connectivity evolution on φ may explain controversial findings on the microstructure evolution of nanoporous gold in experimental studies.
DDC Class
600: Technik
620: Ingenieurwissenschaften
Funding(s)
SFB 986: Teilprojekt B2 - Feste und leichte Hybridwerkstoffe auf Basis nanoporöser Metalle  
More Funding Information
Supported by Deutsche Forschungsgemeinschaft, Projektnummer 192346071–SFB 986.
Lizenz
https://creativecommons.org/licenses/by/4.0/
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