Effects of solute oxygen on kinetics of diffusionless isothermal ω transformation in β-titanium alloys

Norihiko L. Okamoto; Shuhei Kasatani; Martin Luckabauer; Masakazu Tane; Tetsu Ichitsubo

doi:10.1016/j.scriptamat.2020.07.005

Effects of solute oxygen on kinetics of diffusionless isothermal ω transformation in β-titanium alloys

Norihiko L. Okamoto, Shuhei Kasatani, Martin Luckabauer, Masakazu Tane, Tetsu Ichitsubo^*

^*Corresponding author for this work

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Abstract

We have investigated the effects of solute oxygen on the kinetics of diffusionless isothermal omega (DI-ω) transformation in β-titanium vanadium alloys. This transformation constitutes a third category of ω transformation beside the athermal and isothermal modes. Thermal analysis, hardness and internal friction measurements were conducted after quenching oxygen-containing and near-oxygen-free alloys with ~ 21 at%V from the β-stable temperature. At this level of vanadium concentration, the athermal ω transformation is not expected. It is found that the DI-ω transformation more rapidly progresses in the low oxygen alloy and the relaxation strength of the elementary process of {111}_β collapse is significantly reduced.

Original language	English
Pages (from-to)	88-91
Number of pages	4
Journal	Scripta materialia
Volume	188
Early online date	21 Jul 2020
DOIs	https://doi.org/10.1016/j.scriptamat.2020.07.005
Publication status	Published - Nov 2020

Keywords

Differential scanning calorimetry (DSC)
Hardness
Internal friction
Titanium alloys
Aging
22/2 OA procedure

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10.1016/j.scriptamat.2020.07.005

1-s2.0-S1359646220304449-mainFinal published version, 835 KBLicence: Taverne

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title = "Effects of solute oxygen on kinetics of diffusionless isothermal ω transformation in β-titanium alloys",

abstract = "We have investigated the effects of solute oxygen on the kinetics of diffusionless isothermal omega (DI-ω) transformation in β-titanium vanadium alloys. This transformation constitutes a third category of ω transformation beside the athermal and isothermal modes. Thermal analysis, hardness and internal friction measurements were conducted after quenching oxygen-containing and near-oxygen-free alloys with ~ 21 at%V from the β-stable temperature. At this level of vanadium concentration, the athermal ω transformation is not expected. It is found that the DI-ω transformation more rapidly progresses in the low oxygen alloy and the relaxation strength of the elementary process of {111}β collapse is significantly reduced.",

keywords = "Differential scanning calorimetry (DSC), Hardness, Internal friction, Titanium alloys, Aging, 22/2 OA procedure",

author = "Okamoto, {Norihiko L.} and Shuhei Kasatani and Martin Luckabauer and Masakazu Tane and Tetsu Ichitsubo",

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T1 - Effects of solute oxygen on kinetics of diffusionless isothermal ω transformation in β-titanium alloys

AU - Okamoto, Norihiko L.

AU - Kasatani, Shuhei

AU - Luckabauer, Martin

AU - Tane, Masakazu

AU - Ichitsubo, Tetsu

N1 - Elsevier deal

PY - 2020/11

Y1 - 2020/11

N2 - We have investigated the effects of solute oxygen on the kinetics of diffusionless isothermal omega (DI-ω) transformation in β-titanium vanadium alloys. This transformation constitutes a third category of ω transformation beside the athermal and isothermal modes. Thermal analysis, hardness and internal friction measurements were conducted after quenching oxygen-containing and near-oxygen-free alloys with ~ 21 at%V from the β-stable temperature. At this level of vanadium concentration, the athermal ω transformation is not expected. It is found that the DI-ω transformation more rapidly progresses in the low oxygen alloy and the relaxation strength of the elementary process of {111}β collapse is significantly reduced.

AB - We have investigated the effects of solute oxygen on the kinetics of diffusionless isothermal omega (DI-ω) transformation in β-titanium vanadium alloys. This transformation constitutes a third category of ω transformation beside the athermal and isothermal modes. Thermal analysis, hardness and internal friction measurements were conducted after quenching oxygen-containing and near-oxygen-free alloys with ~ 21 at%V from the β-stable temperature. At this level of vanadium concentration, the athermal ω transformation is not expected. It is found that the DI-ω transformation more rapidly progresses in the low oxygen alloy and the relaxation strength of the elementary process of {111}β collapse is significantly reduced.

KW - Differential scanning calorimetry (DSC)

KW - Hardness

KW - Internal friction

KW - Titanium alloys

KW - Aging

KW - 22/2 OA procedure

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DO - 10.1016/j.scriptamat.2020.07.005

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VL - 188

SP - 88

EP - 91

JO - Scripta materialia

JF - Scripta materialia

ER -

Effects of solute oxygen on kinetics of diffusionless isothermal ω transformation in β-titanium alloys

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Keywords

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