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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.

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Document Type:Article
Author:Andrea BachmaierORCiD, Georg Benedikt Rathmayr, Jörg Schmauch, Norbert Schell, Andreas Stark, Niels de JongeORCiD, Reinhard Pippan
Parent Title (English):Journal of Materials Research
First Page:58
Last Page:68
Publisher:Cambridge University Press
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):License LogoCreative Commons - CC BY - Namensnennung 4.0 International