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Title: 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. - Highlights: • Structural evolution in a deformed Cu–Co composite is studied on all length scales. • Amount of intermixing is examined by atom-probe tomography. • Supersaturated solid solutions up to 26 at.% Co in Cu are observed.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1]
  1. Chair of Materials Science and Methods, Saarland University, Saarbrücken (Germany)
  2. Chair of Functional Materials, Saarland University, Saarbrücken (Germany)
  3. INM-Leibniz Institute for New Materials, Saarbrücken (Germany)
Publication Date:
OSTI Identifier:
22476043
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 100; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; COBALT; COMPOSITE MATERIALS; COPPER; DEFORMATION; DISTRIBUTION; ENERGY-LOSS SPECTROSCOPY; FCC LATTICES; MICROSTRUCTURE; MIXING; PLASTICITY; PRESSURE RANGE MEGA PA 10-100; SCANNING ELECTRON MICROSCOPY; SOLID SOLUTIONS; STRAINS; TOMOGRAPHY; TORSION; TRANSMISSION ELECTRON MICROSCOPY