A study of the interaction of oxygen with the α2 phase in the model alloy Ti–7wt%Al
| Autor: | David E.J. Armstrong, David Rugg, Paul A. J. Bagot, Michael P. Moody, H. M. Gardner, Anna Radecka |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Alloy chemistry.chemical_element Thermodynamics 02 engineering and technology Atom probe engineering.material 01 natural sciences Oxygen law.invention law Aluminium 0103 physical sciences General Materials Science 010302 applied physics Precipitation (chemistry) Mechanical Engineering Metals and Alloys 021001 nanoscience & nanotechnology Condensed Matter Physics chemistry Mechanics of Materials Ageing engineering Hardening (metallurgy) Limiting oxygen concentration 0210 nano-technology |
| DOI: | 10.1016/j.scriptamat.2020.03.048 |
| Popis: | Atom Probe Tomography is used to show that the α2 phase (Ti3Al) forms upon ageing Ti–7Al at 550 °C with as little as 500 wppm oxygen. Notably, it is found that oxygen consistently partitions away from the α2 precipitates to the α matrix. The role of aluminium concentration and oxygen solubility on oxygen partitioning preference is also investigated. Based on our observations, we propose a mechanism by which oxygen encourages α2 formation despite partitioning away from it. Furthermore, nanohardness systematically measured with respect to ageing time and oxygen concentration suggests that α2 precipitation is not the dominant hardening mechanism during ageing. |
| Databáze: | OpenAIRE |
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