The formation of ordered clusters in Ti–7Al and Ti–6Al–4V
| Autor: | Hope A. Ishii, Michael P. Moody, David Dye, Tomas L. Martin, Paul A. J. Bagot, David Rugg, Anna Radecka, James Coakley, V.A. Vorontsov |
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| Přispěvatelé: | Engineering & Physical Science Research Council (EPSRC), Rolls-Royce Plc |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Polymers and Plastics Neutron diffraction 02 engineering and technology Electron Atom probe 01 natural sciences law.invention law Phase (matter) 0103 physical sciences Titanium alloys Transmission electron microscopy (TEM) 0912 Materials Engineering Materials Chemical decomposition Ordering 010302 applied physics Metals and Alloys Titanium alloy 021001 nanoscience & nanotechnology Electronic Optical and Magnetic Materials Crystallography Transmission electron microscopy Ceramics and Composites TJ 0210 nano-technology Ternary operation 0913 Mechanical Engineering Atom probe tomography (APT) |
| Zdroj: | Radecka, A, Bagot, P A J, Martin, T L, Coakley, J, Vorontsov, V A, Moody, M P, Ishii, H, Rugg, D & Dye, D 2016, ' The formation of ordered clusters in Ti-7Al and Ti-6Al-4V ', Acta Materialia, vol. 112, pp. 141-149 . https://doi.org/10.1016/j.actamat.2016.03.080 |
| ISSN: | 1359-6454 |
| Popis: | Ti-Al alloys can suffer from a chemical decomposition on ageing around 500°C or on air cooling. At long ageing times this results in the formation of α2 (Ti3Al) precipitates. At reduced times or elevated temperatures, diffuse electron or neutron diffraction peaks can be observed, which has been termed 'short range ordering' (SRO). Here, we present correlative transmission electron microscopy (TEM) and atom probe tomography (APT) results showing that the reaction proceeds through the formation of ordered Al-rich precipitate clusters. Notably, Al-Al clustering could be observed well before the appearance of distinct precipitates in the TEM. In addition, the V-containing α phase of Ti-6Al-4V formed ordered clusters much faster than in binary Ti-7Al. This implies that the ternary addition of β stabilisers exacerbates the problem of α2 precipitate formation in commercial dual phase titanium alloys. |
| Databáze: | OpenAIRE |
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