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Ferrari, A. |
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Schimpf, Christian |
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Dunser, M. |
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Thomas, Eric |
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Gecse, Zoltan |
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Tsrunchev, Peter |
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Della Ricca, Giuseppe |
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Cios, Grzegorz |
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Hohlmann, Marcus |
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Dudarev, A. |
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Mascagna, V. |
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Santimaria, Marco |
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Poudyal, Nabin |
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Piozzi, Antonella |
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Mørtsell, Eva Anne |
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Jin, S. |
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Noel, Cédric |
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Fino, Paolo |
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Mailley, Pascal |
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Meyer, Ernst |
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Zhang, Qi |
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Pfattner, Raphael | Brussels |
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Kooi, Bart J. |
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Babuji, Adara |
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Pauporte, Thierry |
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Völker, B.
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Publications (7/7 displayed)
- 2021On the fracture behavior of Cr 2 AlC coatingscitations
- 2020Mechanical and optical degradation of flexible optical solar reflectors during simulated low earth orbit thermal cyclingcitations
- 2018In-situ observations of the fracture and adhesion of Cu/Nb multilayers on polyimide substratescitations
- 2018Ab initio guided low temperature synthesis strategy for smooth face–centred cubic FeMn thin filmscitations
- 2018Influence of annealing on microstructure and mechanical properties of a nanocrystalline CrCoNi medium-entropy alloycitations
- 2018Interfacial mutations in the Al-polyimide systemcitations
- 2005Spatial light modulators with monocrystalline silicon micromirrors made by wafer bondingcitations
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article
Influence of annealing on microstructure and mechanical properties of a nanocrystalline CrCoNi medium-entropy alloy
Abstract
An equiatomic CrCoNi medium-entropy alloy was subjected to high-pressure torsion. This process led to a refinement of the microstructure to a grain size of about 50 nm, combined with a strong increase in the materials hardness. Subsequently, the thermodynamic stability of the medium entropy alloy was evaluated by isothermal and isochronal heat treatments. Annealed samples were investigated by scanning and transmission electron microscopy as well as X-ray diffraction, and were subjected to tensile tests to establish microstructure-property relationships. Furthermore, a comparison of mechanical properties with a grade 316L stainless steel was performed in order to evaluate if the CrCoNi alloy is competitive with commercially available structural materials in the nanocrystalline state. A minority phase embedded in the face-centered cubic matrix of the CrCoNi alloy could be observed in multiple annealed states, as well as the as-received and high-pressure torsion processed material. For 200 h of annealing at 500 °C, it was determined that the minority phase has a hexagonal-closed-packed crystal structure. A possible explanation for the formation of the phase is a preferential segregation of Co to stacking faults. © 2018 by the authors.