Aluminium segregation profiles in the (110), (100) and (111) surface regions of the Fe0.85Al0.15 random body-centered cubic alloy
| Autor: | Pascal David, Rémi Lazzari, Stéphane Chenot, Patrizia Borghetti, Jacek Goniakowski, Zongbei Dai, Alexey Koltsov, Gregory Cabailh, Jacques Jupille |
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| Přispěvatelé: | Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), ArcelorMittal Maizières Research SA, ArcelorMittal |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Annealing (metallurgy) Alloy General Physics and Astronomy chemistry.chemical_element 02 engineering and technology engineering.material Cubic crystal system 010402 general chemistry 01 natural sciences iron aluminide Aluminium random alloy Phase diagram Condensed matter physics FEAL Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics segregation 0104 chemical sciences Surfaces Coatings and Films chemistry [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] engineering Grain boundary 0210 nano-technology Single crystal |
| Zdroj: | Applied Surface Science Applied Surface Science, Elsevier, 2019, 492, pp.886-895. ⟨10.1016/j.apsusc.2019.06.235⟩ |
| ISSN: | 0169-4332 |
| Popis: | International audience; Thanks to a dedicated modelling of intensities, the depth sensitivity of X-ray photoemission is used to probe the segregation profile of aluminium at the (110), (100) and (111) low index surfaces of the body-centred Fe 0.85 Al 0.15 random alloy. Sputtered surface composition is close to the nominal bulk one, thus excluding preferential sputtering. Surface enrichment in aluminium upon annealing starts at around 700 K before reaching a stationary state above 1000 K. The average surface composition is close to Fe 0.5 Al 0.5 , corresponding to the B 2 CsCl structure on the phase diagram. The impacted depth, that is in the range of 2.5-3.5 nm, is quite significant. Although not evidenced previously in surface science conditions at FeAl single crystal surfaces, it is qualitatively in agreement with the segregation at grain boundaries and shear planes of Al-alloyed steels. This segregation tendency is rationalized through ab initio calculations. |
| Databáze: | OpenAIRE |
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