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Structural evolution and strain induced mixing in Cu–Co composites studied by transmission electron microscopy and atom probe tomography

  • A Cu–Co composite material is chosen as a model system to study structural evolution and phase formations during severe plastic deformation. The evolving microstructures as a function of the applied strain were characterized at the micro-, nano-, and atomic scale-levels by combining scanning electron microscopy and transmission electron microscopy including energy-filtered transmission electron microscopy and electron energy-loss spectroscopy. The amount of intermixing between the two phases at different strains was examined at the atomic scale using atom probe tomography as complimentary method. It is shown that Co particles are dissolved in the Cu matrix during severe plastic deformation to a remarkable extent and their size, number, and volume fraction were quantitatively determined during the deformation process. From the results, it can be concluded that supersaturated solid solutions up to 26 at.% Co in a fcc Cu–26 at.% Co alloy are obtained during deformation. However, the distribution of Co was found to be inhomogeneous even at the highest degree of investigated strain.

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  • Supplementary Fig. S1. SEM micrograph of the Cu-Co alloy sample deformed to a strain of 98 showing the approximate position of the site specific APT specimens (εeq98-I, εeq98-II and εeq98-III).

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Document Type:Article
Author:Andrea BachmaierORCiD, Hisham AboulfadlORCiD, Marina Pfaff, Frank MücklichORCiD, Christian Motz
Parent Title (English):Materials Characterization
First Page:178
Last Page:191
Year of first Publication:2015
Release Date:2022/11/18
Tag:Cu–Co; atom probe tomography; high-pressure torsion; mechanical alloying; microstructure; nano-composite; transmission electron microscopy
Impact:02.383 (2015)
Scientific Units:Innovative Electron Microscopy
Open Access:Open Access
Signature:INM 2015/13
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International