High strength nanocrystalline Cu–Co alloys with high tensile ductility
- 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.
Document Type: | Article |
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Author: | Andrea BachmaierORCiD, Georg Benedikt Rathmayr, Jörg Schmauch, Norbert Schell, Andreas Stark, Niels de JongeORCiD, Reinhard Pippan |
URN: | urn:nbn:de:bsz:291:415-2838 |
DOI: | https://doi.org/10.1557/jmr.2018.185 |
ISSN: | 0884-2914 |
Parent Title (English): | Journal of Materials Research |
Volume: | 34 |
Issue: | 1 |
First Page: | 58 |
Last Page: | 68 |
Publisher: | Cambridge University Press |
Language: | English |
Year of first Publication: | 2019 |
Date of final exam: | 2018/09/21 |
Release Date: | 2022/11/18 |
Tag: | alloy; annealing; ductility; nanostructure; strength |
Impact: | 02.562 (2019) |
Funding Information: | Cambridge University Press |
Scientific Units: | Innovative Electron Microscopy |
Open Access: | Open Access |
Signature: | INM 2019/009 |
Licence (German): | ![]() |