A binary beta titanium superalloy containing ordered-beta TiFe, alpha and omega

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A binary beta titanium superalloy containing ordered-beta TiFe, alpha and omega. / Jones, R.D.; Knowles, Sandy; Clegg, W.J. .

In: Scripta Materialia, Vol. 200, 113905, 15.07.2021.

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@article{2c64aa88427940d2a4f30686c16b0f29,
title = "A binary beta titanium superalloy containing ordered-beta TiFe, alpha and omega",
abstract = "Alpha-beta titanium alloys excel for aeroengine applications but are typically limited to ~550°C. An alternative strategy is reinforcement with the ordered-beta TiFe intermetallic, toward {\textquoteleft}β-Ti superalloys{\textquoteright}, however, there has been minimal study of TiFe precipitation in the binary system.Here, a Ti-20Fe (at.%) alloy was homogenised at 1050°C in the β-Ti phase field and aged at 600°C where the Fe supersaturation promoted TiFe precipitation. Curiously, as the TiFe volume fraction increased, the alloy hardness decreased, due to an interplay of mechanisms: (1) Fe solid solution strengthening, which reduces as the β-Ti Fe content falls to 16.2% on ageing; (2) ω precipitation strengthening, as ω-like incommensurate modulated domains were identified by transmission electron microscopy in the homogenised β-Ti parent phase and are suggested to change in size and structure after ageing, resulting in reduced ω-strengthening; (3) softening as softer TiFe and α-Ti phases precipitate from the harder ω‑strengthened β-Ti parent phase.",
keywords = "Titanium alloys, Precipitation, Microstructure, Hardness, Metastable Phases",
author = "R.D. Jones and Sandy Knowles and W.J. Clegg",
year = "2021",
month = jul,
day = "15",
doi = "10.1016/j.scriptamat.2021.113905",
language = "English",
volume = "200",
journal = "Scripta Materialia",
issn = "1359-6462",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - A binary beta titanium superalloy containing ordered-beta TiFe, alpha and omega

AU - Jones, R.D.

AU - Knowles, Sandy

AU - Clegg, W.J.

PY - 2021/7/15

Y1 - 2021/7/15

N2 - Alpha-beta titanium alloys excel for aeroengine applications but are typically limited to ~550°C. An alternative strategy is reinforcement with the ordered-beta TiFe intermetallic, toward ‘β-Ti superalloys’, however, there has been minimal study of TiFe precipitation in the binary system.Here, a Ti-20Fe (at.%) alloy was homogenised at 1050°C in the β-Ti phase field and aged at 600°C where the Fe supersaturation promoted TiFe precipitation. Curiously, as the TiFe volume fraction increased, the alloy hardness decreased, due to an interplay of mechanisms: (1) Fe solid solution strengthening, which reduces as the β-Ti Fe content falls to 16.2% on ageing; (2) ω precipitation strengthening, as ω-like incommensurate modulated domains were identified by transmission electron microscopy in the homogenised β-Ti parent phase and are suggested to change in size and structure after ageing, resulting in reduced ω-strengthening; (3) softening as softer TiFe and α-Ti phases precipitate from the harder ω‑strengthened β-Ti parent phase.

AB - Alpha-beta titanium alloys excel for aeroengine applications but are typically limited to ~550°C. An alternative strategy is reinforcement with the ordered-beta TiFe intermetallic, toward ‘β-Ti superalloys’, however, there has been minimal study of TiFe precipitation in the binary system.Here, a Ti-20Fe (at.%) alloy was homogenised at 1050°C in the β-Ti phase field and aged at 600°C where the Fe supersaturation promoted TiFe precipitation. Curiously, as the TiFe volume fraction increased, the alloy hardness decreased, due to an interplay of mechanisms: (1) Fe solid solution strengthening, which reduces as the β-Ti Fe content falls to 16.2% on ageing; (2) ω precipitation strengthening, as ω-like incommensurate modulated domains were identified by transmission electron microscopy in the homogenised β-Ti parent phase and are suggested to change in size and structure after ageing, resulting in reduced ω-strengthening; (3) softening as softer TiFe and α-Ti phases precipitate from the harder ω‑strengthened β-Ti parent phase.

KW - Titanium alloys

KW - Precipitation

KW - Microstructure

KW - Hardness

KW - Metastable Phases

U2 - 10.1016/j.scriptamat.2021.113905

DO - 10.1016/j.scriptamat.2021.113905

M3 - Article

VL - 200

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

M1 - 113905

ER -