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| Naji, M. |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Zehetbauer, Michael J.
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Topics
Publications (8/8 displayed)
- 2024Effect of V content on the microstructure and mechanical properties of HPT nanostructured CoCrFeMnNiV x high entropy alloys
- 2023Can Severe Plastic Deformation Tune Nanocrystallization in Fe-Based Metallic Glasses?citations
- 2021Enhancing the Mechanical Properties of Biodegradable Mg Alloys Processed by Warm HPT and Thermal Treatmentscitations
- 2020The effects of severe plastic deformation and/or thermal treatment on the mechanical properties of biodegradable mg-alloyscitations
- 2020Anomalous Evolution of Strength and Microstructure of High-Entropy Alloy CoCrFeNiMn after High-Pressure Torsion at 300 and 77 Kcitations
- 2019Exceptional Strengthening of Biodegradable Mg-Zn-Ca Alloys through High Pressure Torsion and Subsequent Heat Treatmentcitations
- 2019Characterization of strain bursts in high density polyethylene by means of a novel nano creep testcitations
- 2016Producing bulk ultrafine-grained materials by severe plastic deformation: ten years latercitations
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article
Anomalous Evolution of Strength and Microstructure of High-Entropy Alloy CoCrFeNiMn after High-Pressure Torsion at 300 and 77 K
Abstract
Ultrafine and nanocrystalline states of equiatomic face-centered cubic (fcc) high-entropy alloy (HEA) CoCrFeNiMn (“Cantor” alloy) are achieved by high-pressure torsion (HPT) at 300 K (room temperature, RT) and 77 K (cryo). Although the hardness after RT-HPT reaches exceptionally high values, those from cryo-HPT are distinctly lower, at least when the torsional strain lies beyond γ = 25. The values are stable even during long-time storage at ambient temperature. A similar paradoxal result is reflected by torque data measured in situ during HPT processing. The reasons for this paradox are attributed to the enhanced hydrostatic pressure, cryogenic temperature, and especially large shear strains achieved by the cryo-HPT. At these conditions, selected area electron diffraction (SAD) patterns indicate that a partial local phase change from fcc to hexagonal close-packed (hcp) structure occurs, which results in a highly heterogeneous structure. This heterogeneity is accompanied by both an increase in average grain size and especially a strong decrease in average dislocation density, which is estimated to mainly cause the paradox low strength.