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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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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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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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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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Kontis, Paraskevas
Norwegian University of Science and Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2024Microstructural and Thermomechanical Assessment of Computationally Designed Ni-Based SX Superalloys
- 2023Investigation of the Microstructure of Bismuth Alloy and its Interaction With Cement and Steel Casingcitations
- 2022Chemical redistribution and change in crystal lattice parameters during stress relaxation annealing of the AD730 superalloycitations
- 2021Nanoscale characterisation of hydrides and secondary phase particles in Zircaloy-4citations
- 2021Enhanced creep performance in a polycrystalline superalloy driven by atomic-scale phase transformation along planar faultscitations
- 2021Nucleation mechanism of hetero-epitaxial recrystallization in wrought nickel-based superalloyscitations
- 2020Mechanisms of Ti3Al precipitation in hcp alpha-Ti
- 2020Electronic structure based design of thin film metallic glasses with superior fracture toughnesscitations
- 2020A cracking oxygen story: a new view of stress corrosion cracking in titanium alloys
- 2019Atomic-scale grain boundary engineering to overcome hot-cracking in additively-manufactured superalloyscitations
- 2019Ti and its alloys as examples of cryogenic focused ion beam milling of environmentally-sensitive materialscitations
- 2019Atomistic phase field chemomechanical modeling of dislocation-solute-precipitate interaction in Ni–Al–Cocitations
- 2018Thin-Wall Debit in Creep of DS200 + Hf Alloycitations
- 2018Hot cracking mechanism affecting a non-weldable Ni-based superalloy produced by selective electron Beam Meltingcitations
- 2018Consequences of a Room-Temperature Plastic Deformation During Processing on Creep Durability of a Ni-Based SX Superalloycitations
- 2017On the role of boron on improving ductility in a new polycrystalline superalloycitations
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document
A cracking oxygen story: a new view of stress corrosion cracking in titanium alloys
Abstract
Titanium alloys can suffer from halide-associated stress corrosion cracking at elevated temperatures e.g. in jet engines, where chlorides and Ti-oxide promote the cracking of water vapour in the gas stream, depositing embrittling species at the crack tip. Here we report, using isotopically-labelled experiments, that crack tips in an industrial Ti-6Al-2Sn-4Zr-6Mo alloy are strongly enriched ( > 5 at.%) in oxygen from the water vapour, far greater than the amounts (0.25 at.%) required to embrittle the material. Surprisingly, relatively little hydrogen is measured, despite careful preparation. Therefore, we suggest that a synergistic effect of O and H leads to cracking, with O playing a vital role, since O is well-known to cause embrittlement of the alloy. In contrast it appears that in alpha-beta Ti alloys, it may be that H may drain away into the bulk owing to its high solubility in beta-Ti, rather than being retained in the stress field of the crack tip. Therefore, whilst hydrides may form on the fracture surface, hydrogen ingress might not res ult in embrittlement of the underlying matrix. This possibility challenges decades of understanding of stress-corrosion cracking as being related only to the hydrogen enhanced localised plasticity (HELP) mechanism, which explains why H-doped Ti alloys are embrittled. This would change the perspective on stress corrosion embrittlement away from a focus on hydrogen towards the ingress of O originating from the water vapour, insights critical for designing corrosion resistant materials.