Precipitation processes in the beta-titanium alloy Ti-5Al-5Mo-5V-3Cr

James Coakley, Vassili A. Vorontsov, Nicholas G. Jones, Anna Radecka, Paul A.J. Bagot, Kenneth C. Littrell, Richard K. Heenan, Frédéric Hu, Andrew P. Magyar, David C. Bell, David Dye

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Abstract Precipitate evolution in Ti-5Al-5Mo-5V-3Cr-0.3Fe wt.% (Ti-5553) has been studied in-situ by small angle neutron scattering (SANS) during a two step ageing heat treatment of 300°C/8h+500°C/2 h. The first heat treatment step precipitates ω, with a corresponding increase in hardness of ∼15% compared to quenched material. The second heat treatment step precipitates fine scale α from the ω phase, with a ∼90% increase in hardness compared to quenched material. The SANS measurements are complemented by atom probe tomography (APT) to give compositional information, ex-situ transmission electron microscopy (TEM) to confirm phase identification and size distribution locally, and X-ray diffraction (XRD) for additional confirmation of phase identification. The ω phase is depleted in all the solute additions following 300°C/8 h ageing heat treatment. The volume fraction of the ω phase from APT is estimated to be ∼7%. SANS modelling is consistent with disc shaped particles for the ω phase. The mean particle diameter increases from ∼7.5 nm to 9.5 nm diameter between 1 h and 8 h heat treatment at 300 °C, while the thickness increases from ∼4 nm to ∼5 nm. The SANS model estimates the volume fraction to be ∼10% for the 8 h heat treatment, using the phase compositions from APT.

LanguageEnglish
Article number34520
Pages946-953
Number of pages8
JournalJournal of Alloys and Compounds
Volume646
DOIs
Publication statusPublished - 7 Jul 2015

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Titanium alloys
Heat treatment
Neutron scattering
Tomography
Precipitates
Atoms
Volume fraction
Aging of materials
Hardness
Phase composition
beta titanium
Transmission electron microscopy
X ray diffraction

Keywords

  • atom probe tomography (APT)
  • precipitation
  • small angle neutron scattering (SANS)
  • titanium alloys
  • transmission electron microscopy (TEM)

Cite this

Coakley, J., Vorontsov, V. A., Jones, N. G., Radecka, A., Bagot, P. A. J., Littrell, K. C., ... Dye, D. (2015). Precipitation processes in the beta-titanium alloy Ti-5Al-5Mo-5V-3Cr. Journal of Alloys and Compounds, 646, 946-953. [34520]. https://doi.org/10.1016/j.jallcom.2015.05.251
Coakley, James ; Vorontsov, Vassili A. ; Jones, Nicholas G. ; Radecka, Anna ; Bagot, Paul A.J. ; Littrell, Kenneth C. ; Heenan, Richard K. ; Hu, Frédéric ; Magyar, Andrew P. ; Bell, David C. ; Dye, David. / Precipitation processes in the beta-titanium alloy Ti-5Al-5Mo-5V-3Cr. In: Journal of Alloys and Compounds. 2015 ; Vol. 646. pp. 946-953.
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title = "Precipitation processes in the beta-titanium alloy Ti-5Al-5Mo-5V-3Cr",
abstract = "Abstract Precipitate evolution in Ti-5Al-5Mo-5V-3Cr-0.3Fe wt.{\%} (Ti-5553) has been studied in-situ by small angle neutron scattering (SANS) during a two step ageing heat treatment of 300°C/8h+500°C/2 h. The first heat treatment step precipitates ω, with a corresponding increase in hardness of ∼15{\%} compared to quenched material. The second heat treatment step precipitates fine scale α from the ω phase, with a ∼90{\%} increase in hardness compared to quenched material. The SANS measurements are complemented by atom probe tomography (APT) to give compositional information, ex-situ transmission electron microscopy (TEM) to confirm phase identification and size distribution locally, and X-ray diffraction (XRD) for additional confirmation of phase identification. The ω phase is depleted in all the solute additions following 300°C/8 h ageing heat treatment. The volume fraction of the ω phase from APT is estimated to be ∼7{\%}. SANS modelling is consistent with disc shaped particles for the ω phase. The mean particle diameter increases from ∼7.5 nm to 9.5 nm diameter between 1 h and 8 h heat treatment at 300 °C, while the thickness increases from ∼4 nm to ∼5 nm. The SANS model estimates the volume fraction to be ∼10{\%} for the 8 h heat treatment, using the phase compositions from APT.",
keywords = "atom probe tomography (APT), precipitation, small angle neutron scattering (SANS), titanium alloys, transmission electron microscopy (TEM)",
author = "James Coakley and Vorontsov, {Vassili A.} and Jones, {Nicholas G.} and Anna Radecka and Bagot, {Paul A.J.} and Littrell, {Kenneth C.} and Heenan, {Richard K.} and Fr{\'e}d{\'e}ric Hu and Magyar, {Andrew P.} and Bell, {David C.} and David Dye",
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Coakley, J, Vorontsov, VA, Jones, NG, Radecka, A, Bagot, PAJ, Littrell, KC, Heenan, RK, Hu, F, Magyar, AP, Bell, DC & Dye, D 2015, 'Precipitation processes in the beta-titanium alloy Ti-5Al-5Mo-5V-3Cr' Journal of Alloys and Compounds, vol. 646, 34520, pp. 946-953. https://doi.org/10.1016/j.jallcom.2015.05.251

Precipitation processes in the beta-titanium alloy Ti-5Al-5Mo-5V-3Cr. / Coakley, James; Vorontsov, Vassili A.; Jones, Nicholas G.; Radecka, Anna; Bagot, Paul A.J.; Littrell, Kenneth C.; Heenan, Richard K.; Hu, Frédéric; Magyar, Andrew P.; Bell, David C.; Dye, David.

In: Journal of Alloys and Compounds, Vol. 646, 34520, 07.07.2015, p. 946-953.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Precipitation processes in the beta-titanium alloy Ti-5Al-5Mo-5V-3Cr

AU - Coakley, James

AU - Vorontsov, Vassili A.

AU - Jones, Nicholas G.

AU - Radecka, Anna

AU - Bagot, Paul A.J.

AU - Littrell, Kenneth C.

AU - Heenan, Richard K.

AU - Hu, Frédéric

AU - Magyar, Andrew P.

AU - Bell, David C.

AU - Dye, David

PY - 2015/7/7

Y1 - 2015/7/7

N2 - Abstract Precipitate evolution in Ti-5Al-5Mo-5V-3Cr-0.3Fe wt.% (Ti-5553) has been studied in-situ by small angle neutron scattering (SANS) during a two step ageing heat treatment of 300°C/8h+500°C/2 h. The first heat treatment step precipitates ω, with a corresponding increase in hardness of ∼15% compared to quenched material. The second heat treatment step precipitates fine scale α from the ω phase, with a ∼90% increase in hardness compared to quenched material. The SANS measurements are complemented by atom probe tomography (APT) to give compositional information, ex-situ transmission electron microscopy (TEM) to confirm phase identification and size distribution locally, and X-ray diffraction (XRD) for additional confirmation of phase identification. The ω phase is depleted in all the solute additions following 300°C/8 h ageing heat treatment. The volume fraction of the ω phase from APT is estimated to be ∼7%. SANS modelling is consistent with disc shaped particles for the ω phase. The mean particle diameter increases from ∼7.5 nm to 9.5 nm diameter between 1 h and 8 h heat treatment at 300 °C, while the thickness increases from ∼4 nm to ∼5 nm. The SANS model estimates the volume fraction to be ∼10% for the 8 h heat treatment, using the phase compositions from APT.

AB - Abstract Precipitate evolution in Ti-5Al-5Mo-5V-3Cr-0.3Fe wt.% (Ti-5553) has been studied in-situ by small angle neutron scattering (SANS) during a two step ageing heat treatment of 300°C/8h+500°C/2 h. The first heat treatment step precipitates ω, with a corresponding increase in hardness of ∼15% compared to quenched material. The second heat treatment step precipitates fine scale α from the ω phase, with a ∼90% increase in hardness compared to quenched material. The SANS measurements are complemented by atom probe tomography (APT) to give compositional information, ex-situ transmission electron microscopy (TEM) to confirm phase identification and size distribution locally, and X-ray diffraction (XRD) for additional confirmation of phase identification. The ω phase is depleted in all the solute additions following 300°C/8 h ageing heat treatment. The volume fraction of the ω phase from APT is estimated to be ∼7%. SANS modelling is consistent with disc shaped particles for the ω phase. The mean particle diameter increases from ∼7.5 nm to 9.5 nm diameter between 1 h and 8 h heat treatment at 300 °C, while the thickness increases from ∼4 nm to ∼5 nm. The SANS model estimates the volume fraction to be ∼10% for the 8 h heat treatment, using the phase compositions from APT.

KW - atom probe tomography (APT)

KW - precipitation

KW - small angle neutron scattering (SANS)

KW - titanium alloys

KW - transmission electron microscopy (TEM)

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U2 - 10.1016/j.jallcom.2015.05.251

DO - 10.1016/j.jallcom.2015.05.251

M3 - Article

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EP - 953

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T2 - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 34520

ER -