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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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| 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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Ikeda, Yuki
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Topics
Publications (11/11 displayed)
- 2024Giant segregation transition as origin of liquid metal embrittlement in the Fe-Zn systemcitations
- 2024Early stages of liquid-metal embrittlement in a 3rd generation advanced high strength steel
- 2023Giant segregation transition as origin of liquid metal embrittlement in the Fe-Zn system
- 2023Growth Twins and Premartensite Microstructure in Epitaxial Ni-Mn-Ga Filmscitations
- 2023Segregation-induced grain-boundary precipitation during early stages of liquid-metal embrittlement of an advanced high-strength steelcitations
- 2022In situ thermal annealing transmission electron microscopy of irradiation induced Fe nanoparticle precipitation in Fe–Si alloycitations
- 2022In situ thermal annealing transmission electron microscopy of irradiation induced Fe nanoparticle precipitation in Fe–Si alloycitations
- 2021Evidence of room-temperature shear-deformation in a Cu-Al intermetalliccitations
- 2021Early stages of liquid-metal embrittlement in an advanced high-strength steelcitations
- 2021Crystal structure characterization of martensite of Cu–Zn–Al ternary alloy by spherical aberration corrected scanning transmission electron microscopycitations
- 2021Strain-dependent shear-band structure in a Zr-based bulk metallic glasscitations
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article
Giant segregation transition as origin of liquid metal embrittlement in the Fe-Zn system
Abstract
A giant Zn segregation transition is revealed using CALPHAD-integrated density-based modelling of Zn segregation into Fe grain boundaries (GBs). The results show that above a threshold of only a few atomic percent Zn in the alloy, a substantial amount of up to 60 at.% Zn can segregate to the GB. We also found that the amount of segregation significantly increases with decreasing temperature, while the required Zn content in the alloy for triggering the segregation transition decreases. Direct evidence of this Zn segregation transition is obtained using high-resolution scanning transmission electron microscopy. We trace the origin of the segregation transition and its temperature dependence back to the low cohesive energy of Zn and a miscibility gap in Fe-Zn GB, arising from the magnetic ordering effect, which is demonstrated by ab initio calculations. We show that the massive Zn segregation resulting from the segregation transition greatly assists with liquid wetting and reduces the work of separation along the GB. These findings reveal the fundamental origin of GB weakening and therefore liquid metal embrittlement in the Fe-Zn system.