The formation of ordered clusters in Ti-7Al and Ti-6Al-4V

A. Radecka, P.A.J. Bagot, T.L. Martin, J. Coakley, V.A. Vorontsov, M.P. Moody, H. Ishii, D. Rugg, D. Dye

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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.

LanguageEnglish
Pages141-149
Number of pages9
JournalActa Materialia
Volume112
Early online date18 Apr 2016
DOIs
Publication statusPublished - 15 Jun 2016

Fingerprint

Precipitates
Aging of materials
Transmission electron microscopy
Neutron diffraction
Titanium alloys
Electron diffraction
Tomography
Cooling
Decomposition
Atoms
Air
Temperature

Keywords

  • atom probe tomography (APT)
  • ordering
  • titanium alloys
  • transmission electron microscopy (TEM)

Cite this

Radecka, A., Bagot, P. A. J., Martin, T. L., Coakley, J., Vorontsov, V. A., Moody, M. P., ... Dye, D. (2016). The formation of ordered clusters in Ti-7Al and Ti-6Al-4V. Acta Materialia, 112, 141-149. https://doi.org/10.1016/j.actamat.2016.03.080
Radecka, A. ; Bagot, P.A.J. ; Martin, T.L. ; Coakley, J. ; Vorontsov, V.A. ; Moody, M.P. ; Ishii, H. ; Rugg, D. ; Dye, D. / The formation of ordered clusters in Ti-7Al and Ti-6Al-4V. In: Acta Materialia. 2016 ; Vol. 112. pp. 141-149.
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Radecka, A, Bagot, PAJ, Martin, TL, Coakley, J, Vorontsov, VA, Moody, MP, 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

The formation of ordered clusters in Ti-7Al and Ti-6Al-4V. / Radecka, A.; Bagot, P.A.J.; Martin, T.L.; Coakley, J.; Vorontsov, V.A.; Moody, M.P.; Ishii, H.; Rugg, D.; Dye, D.

In: Acta Materialia, Vol. 112, 15.06.2016, p. 141-149.

Research output: Contribution to journalArticle

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AU - Radecka, A.

AU - Bagot, P.A.J.

AU - Martin, T.L.

AU - Coakley, J.

AU - Vorontsov, V.A.

AU - Moody, M.P.

AU - Ishii, H.

AU - Rugg, D.

AU - Dye, D.

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Radecka A, Bagot PAJ, Martin TL, Coakley J, Vorontsov VA, Moody MP et al. The formation of ordered clusters in Ti-7Al and Ti-6Al-4V. Acta Materialia. 2016 Jun 15;112:141-149. https://doi.org/10.1016/j.actamat.2016.03.080