Journal
JOURNAL OF MATERIALS RESEARCH
Volume 34, Issue 1, Pages 58-68Publisher
SPRINGER HEIDELBERG
DOI: 10.1557/jmr.2018.185
Keywords
alloy; annealing; nanostructure; ductility; strength
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Funding
- European Research Council under ERC [340185 USMS]
- Austrian Science Fund (FWF) [J3468-N20]
- DESY Hamburg (Germany), of the a Helmholtz Association (HGF) [I-20170215 EC]
- Leibniz Institute for New Materials, Saarbrucken (Germany)
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A supersaturated single-phase Cu-26 at.% Co alloy was produced by high-pressure torsion deformation, leading to a nanocrystalline microstructure with a grain size smaller than 100 nm. The nonequilibrium solid solution decomposed during subsequent isothermal annealing. In situ high-energy X-ray diffraction was used to map changes linked to the separating phases, and the development of a nanoscale Cu-Co composite structure was observed. To gain further information about the relationship of the microstructure and the mechanical properties after phase separation, uniaxial tensile tests were conducted on as-deformed and isothermally annealed samples. Based on the in situ diffraction data, different isothermal annealing temperatures were chosen. Miniaturized tensile specimens with a round cross section were tested, and an image-based data evaluation method enabled the evaluation of true stress-strain curves and strain hardening behavior. The main results are as follows: all microstructural states showed high strength and ductility, which was achieved by a combination of strain-hardening and strain-rate hardening.
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