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

SCRIPTA MATERIALIA

卷:117

Article

Radecka, A.¹  Coakley, J.^2,3  Vorontsov, V. A.¹  Martin, T. L.⁴  Bagot, P. A. J.⁴  Moody, M. P.⁴  Rugg, D.⁵  Dye, D.¹ 

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, Royal Sch Mines, Prince Consort Rd, London SW7 2BP, England

[2] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 OF3, England

[3] Northwestern Univ, Dept Mat Sci & Engn, 2220 Campus Dr, Evanston, IL 60208 USA

[4] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

[5] Rolls Royce PLC, Elton Rd, Derby DE24 8BJ, England

关键词: Titanium alloys;    Precipitation;    Atom probe tomography;    Transmission electron microscopy (TEM);   

DOI  :  10.1016/j.scriptamat.2016.02.015

来源: Elsevier

【 摘 要 】

Precipitate evolution in a near-alpha 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 degrees C, while after ageing at 700 degrees C they become ellipsoids with the major axis lying close to the [0001] direction. At longer ageing times, the alpha(2) precipitates were found to contain greater amounts of Sn + Si, indicating that Sn and Si are stronger Ti-3(Al,Sn,Si) formers than Al. (C) 2016 Elsevier Ltd. All rights reserved.

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