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  4. Grain boundary formation through particle detachment during coarsening of nanoporous metals
 
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Grain boundary formation through particle detachment during coarsening of nanoporous metals

Publikationstyp
Journal Article
Date Issued
2021-07-27
Sprache
English
Author(s)
Elder, Kate L.M.  
Beck Andrews, W.  
Ziehmer, Markus  
Mameka, Nadiia  
Kirchlechner, Christoph  
Davydok, Anton  
Micha, Jean Sébastien  
Chadwick, Alexander F.  
Lilleodden, Erica  
Thornton, Katsuyo  
Voorhees, Peter W.  
Institut
Keramische Hochleistungswerkstoffe M-9  
TORE-URI
http://hdl.handle.net/11420/10117
Journal
Proceedings of the National Academy of Sciences of the United States of America  
Volume
118
Issue
30
Article Number
e2104132118
Citation
Proceedings of the National Academy of Sciences of the United States of America 118 (30): e2104132118 (2021-07-27)
Publisher DOI
10.1073/pnas.2104132118
Scopus ID
2-s2.0-85110962134
PubMed ID
34285076
Grain boundary formation during coarsening of nanoporous gold (NPG) is investigated wherein a nanocrystalline structure can form by particles detaching and reattaching to the structure. MicroLaue and electron backscatter diffraction measurements demonstrate that an in-grain orientation spread develops as NPG is coarsened. The volume fraction of the NPG sample is near the limit of bicontinuity, at which simulations predict that a bicontinuous structure begins to fragment into independent particles during coarsening. Phase-field simulations of coarsening using a computationally generated structure with a volume fraction near the limit of bicontinuity are used to model particle detachment rates. This model is tested by using the measured NPG structure as an initial condition in the phase-field simulations. We predict that up to ∼5% of the NPG structure detaches as a dealloyed Ag75Au25 sample is annealed at 300 ◦C for 420 min. The quantity of volume detached is found to be highly dependent on the volume fraction and volume fraction homogeneity of the nanostructure. As the void phase in the experiments cannot support independent particles, they must fall and reattach to the structure, a process that results in the formation of new grain boundaries. This particle reattachment process, along with other classic processes, leads to the formation of grain boundaries during coarsening in nanoporous metals. The formation of grain boundaries can impact a variety of applications, including mechanical strengthening; thus, the consideration and understanding of particle detachment phenomena are essential when studying nanoporous metals.
Subjects
Nanoporous
particle detachment
coarsening
phase-field modeling
polycrystalline
DDC Class
000: Allgemeines, Wissenschaft
Funding(s)
SFB 986: Teilprojekt B02 - Feste und leichte Hybridwerkstoffe auf Basis nanoporöser Metalle  
SFB 986: Teilprojekt B04 - Mikromechanisches Materialverhalten hierarchischer Werkstoffe  
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