| 1. |
- Ahmadkhaniha, Donya, et al.
(författare)
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Effect of high-pressure torsion on microstructure, mechanical properties and corrosion resistance of cast pure Mg
- 2017
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Konferensbidrag (refereegranskat)abstract
- High-pressure torsion (HPT) processing was applied to cast pure Mg pieces and its effects on microstructure, hardness and tensile properties as well as corrosion resistance were evaluated. The microstructure of the processed samples was examined by electron backscatter diffraction (EBSD) and the mechanical properties were determined by microhardness and tensile tests. Corrosion resistance of the samples was studied via electrochemical impedance spectroscopy (EIS) in 3.5% NaCl solution. The results showed that HPT refined the grain size of Mg very effectively from millimeters in the cast structure to a few micrometers homogeneously through the thickness and created a basal texture on the surface. One or five turns of HPT produced no significant difference in the grain size of the processed Mg but the hardness was a maximum after one turn. The yield strength of the cast Mg was increased by seven times whereas the corrosion resistance was not affected by the HPT processing.
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| 2. |
- Deflorian, F., et al.
(författare)
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Stress corrosion cracking (SCC) failure in marine areas of fixed guards for climbing
- 2015
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Ingår i: Corrosion Engineering, Science and Technology. - 1478-422X .- 1743-2782. ; 50:6, s. 462-466
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Tidskriftsartikel (refereegranskat)abstract
- This work studies the particular mechanism of environmental stress corrosion cracking (SCC) that has been described to interest stainless steel products, like climbing anchors, installed in sea areas. The failure analysis of several broken anchors was carried out. The samples were collected in different parts of the world, always from climbing structures close to the sea. The analysis confirmed the stress corrosion mechanism of degradation, giving also important information about the specific environments causing the metal fracture. These results are in agreement with a few previous works about this subject and are in the frame of the larger topic of SCC of austenitic stainless steel at room temperature. Moreover, some corrosion tests were carried out on stainless steel samples simulating the operation conditions, after contamination with electrolytes at different concentration. The tests are performed in order to better understand the degradation mechanism and to evaluate the influence of some environmental parameters over the susceptibility to SCC. With these experimental data, a possible interpretation model has been proposed together with some reasonable solutions for the material selection process, considering the problem's characteristics and the multiple alternatives available nowadays for climbing materials.
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| 3. |
- Kohandel, M., et al.
(författare)
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Kinematics of z ≥ 6 galaxies from [C II] line emission
- 2019
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 487:3, s. 3007-3020
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Tidskriftsartikel (refereegranskat)abstract
- We study the kinematical properties of galaxies in the Epoch of Reionization via the [C ii]158 μm line emission. The line profile provides information on the kinematics as well as structural properties such as the presence of a disc and satellites. To understand how these properties are encoded in the line profile, first we develop analytical models from which we identify disc inclination and gas turbulent motions as the key parameters affecting the line profile. To gain further insights, we use 'Althæa', a highly resolved (30\, \rm pc) simulated prototypical Lyman-break galaxy, in the redshift range z = 6-7, when the galaxy is in a very active assembling phase. Based on morphology, we select three main dynamical stages: (I) merger, (II) spiral disc, and (III) disturbed disc. We identify spectral signatures of merger events, spiral arms, and extra-planar flows in (I), (II), and (III), respectively. We derive a generalized dynamical mass versus [C ii]-line FWHM relation. If precise information on the galaxy inclination is (not) available, the returned mass estimate is accurate within a factor 2 (4). A Tully-Fisher relation is found for the observed high-z galaxies, i.e. L[C ii] (FWHM)1.80 ± 0.35 for which we provide a simple, physically based interpretation. Finally, we perform mock ALMA simulations to check the detectability of [C ii]. When seen face-on, Althæa is always detected at >5σ; in the edge-on case it remains undetected because the larger intrinsic FWHM pushes the line peak flux below detection limit. This suggests that some of the reported non-detections might be due to inclination effects.
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| 4. |
- Lekka, M., et al.
(författare)
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New European Training Network solving corrosion problems on micro- and nanoscale : mCBEEs
- 2017
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Ingår i: Transactions of the Institute of Metal Finishing. - : Informa UK Limited. - 0020-2967 .- 1745-9192. ; 95:6, s. 297-298
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Tidskriftsartikel (refereegranskat)abstract
- mCBEEs is an acronym for: Advanced integrative solutions to Corrosion problems beyond micro-scale: towards long-term durability of miniaturised Biomedical, Electronic and Energy systems. It is a doctoral student training network funded by the European Commission under the Marie Sklodowska-Curie Action scheme in the same way as the recently reported training network SELECTA that is focusing on smart electrodeposited alloys for environmentally sustainable applications.1.
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