Precipitation of the ordered α2 phase in a near-α titanium alloy

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

doi:10.1016/j.scriptamat.2016.02.015

Precipitation of the ordered α₂ phase in a near-α titanium alloy

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

^*Corresponding author for this work

Design, Manufacturing And Engineering Management

Research output: Contribution to journal › Article › peer-review

51 Citations (Scopus)

15 Downloads (Pure)

Abstract

Precipitate evolution in a near-α alloy was studied using transmission electron microscopy (TEM) and correlative atom probe tomography (APT) after ageing at 550-700 for times up to 28 days. It is found that precipitation occurs much faster and is more prolific in samples heat treated at higher temperatures. Particles were spherical after ageing at 550 °C, while after ageing at 700 °C they become ellipsoids with the major axis lying close to the [0001] direction. At longer ageing times, the α₂ precipitates were found to contain greater amounts of Sn + Si, indicating that Sn and Si are stronger Ti₃(Al,Sn,Si) formers than Al.

Original language	English
Pages (from-to)	81-85
Number of pages	5
Journal	Scripta Materialia
Volume	117
Early online date	10 Mar 2016
DOIs	https://doi.org/10.1016/j.scriptamat.2016.02.015
Publication status	Published - 31 May 2016

Funding

Helpful discussions with Prof. T Lindley, Dr. D. Isheim, Prof. D. Seidman and Prof. D. Dunand are gratefully acknowledged. The project was funded by a Rolls-Royce-EPSRC CASE studentship and by EPSRC grants RP/H004882/1 and EP/K034332/1. JC would like to acknowledge support from an EU FP7 Marie Curie fellowship.

Keywords

atom probe tomography
precipitation
titanium alloys
transmission electron microscopy (TEM)
Ti-Al alloys

Access to Document

10.1016/j.scriptamat.2016.02.015

Radecka-etal-SM-2016-Precipitation-of-the-ordered-α2-phase-in-a-near-α-titanium-alloyAccepted author manuscript, 10 MBLicence: CC BY-NC-ND 4.0

Cite this

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title = "Precipitation of the ordered α2 phase in a near-α titanium alloy",

abstract = "Precipitate evolution in a near-α alloy was studied using transmission electron microscopy (TEM) and correlative atom probe tomography (APT) after ageing at 550-700 for times up to 28 days. It is found that precipitation occurs much faster and is more prolific in samples heat treated at higher temperatures. Particles were spherical after ageing at 550 °C, while after ageing at 700 °C they become ellipsoids with the major axis lying close to the [0001] direction. At longer ageing times, the α2 precipitates were found to contain greater amounts of Sn + Si, indicating that Sn and Si are stronger Ti3(Al,Sn,Si) formers than Al.",

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T1 - Precipitation of the ordered α2 phase in a near-α titanium alloy

AU - Radecka, A.

AU - Coakley, J.

AU - Vorontsov, V. A.

AU - Martin, T. L.

AU - Bagot, P. A. J.

AU - Moody, M. P.

AU - Rugg, D.

AU - Dye, D.

PY - 2016/5/31

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N2 - Precipitate evolution in a near-α alloy was studied using transmission electron microscopy (TEM) and correlative atom probe tomography (APT) after ageing at 550-700 for times up to 28 days. It is found that precipitation occurs much faster and is more prolific in samples heat treated at higher temperatures. Particles were spherical after ageing at 550 °C, while after ageing at 700 °C they become ellipsoids with the major axis lying close to the [0001] direction. At longer ageing times, the α2 precipitates were found to contain greater amounts of Sn + Si, indicating that Sn and Si are stronger Ti3(Al,Sn,Si) formers than Al.

AB - Precipitate evolution in a near-α alloy was studied using transmission electron microscopy (TEM) and correlative atom probe tomography (APT) after ageing at 550-700 for times up to 28 days. It is found that precipitation occurs much faster and is more prolific in samples heat treated at higher temperatures. Particles were spherical after ageing at 550 °C, while after ageing at 700 °C they become ellipsoids with the major axis lying close to the [0001] direction. At longer ageing times, the α2 precipitates were found to contain greater amounts of Sn + Si, indicating that Sn and Si are stronger Ti3(Al,Sn,Si) formers than Al.

KW - atom probe tomography

KW - precipitation

KW - titanium alloys

KW - transmission electron microscopy (TEM)

KW - Ti-Al alloys

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DO - 10.1016/j.scriptamat.2016.02.015

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