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

doi:10.1016/j.actamat.2016.03.080

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^*

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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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.

Original language	English
Pages (from-to)	141-149
Number of pages	9
Journal	Acta Materialia
Volume	112
DOIs	https://doi.org/10.1016/j.actamat.2016.03.080
Publication status	Published - 15 Jun 2016

Keywords

Atom probe tomography (APT)
Ordering
Titanium alloys
Transmission electron microscopy (TEM)

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title = "The formation of ordered clusters in Ti-7Al and Ti-6Al-4V",

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.",

keywords = "Atom probe tomography (APT), Ordering, Titanium alloys, Transmission electron microscopy (TEM)",

author = "A. Radecka and Bagot, {P. A J} and Martin, {T. L.} and J. Coakley and Vorontsov, {V. A.} and Moody, {M. P.} and H. Ishii and D. Rugg and D. Dye",

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doi = "10.1016/j.actamat.2016.03.080",

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T1 - The formation of ordered clusters in Ti-7Al and Ti-6Al-4V

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.

PY - 2016/6/15

Y1 - 2016/6/15

N2 - 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.

AB - 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.

KW - Atom probe tomography (APT)

KW - Ordering

KW - Titanium alloys

KW - Transmission electron microscopy (TEM)

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U2 - 10.1016/j.actamat.2016.03.080

DO - 10.1016/j.actamat.2016.03.080

M3 - Article (Academic Journal)

AN - SCOPUS:84964318906

SN - 1359-6454

VL - 112

SP - 141

EP - 149

JO - Acta Materialia

JF - Acta Materialia

ER -

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

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Keywords

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