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

IMR - Materials Development Division

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

6 Citations (Scopus)

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
DOIs	https://doi.org/10.1016/j.scriptamat.2020.07.005
Publication status	Published - 2020 Nov

Keywords

Aging
Differential scanning calorimetry (DSC)
Hardness
Internal friction
Titanium alloys

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10.1016/j.scriptamat.2020.07.005

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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 = "Aging, Differential scanning calorimetry (DSC), Hardness, Internal friction, Titanium alloys",

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

note = "Funding Information: This work was supported by JST, PRESTO Grant Number JPMJPR1996, and JSPS KAKENHI Grant No. 19H04408, Japan. The authors acknowledge the staffs of Analytical Research Core for Advanced Materials (ARCAM), Institute for Materials Research of Tohoku University. Funding Information: This work was supported by JST , PRESTO Grant Number JPMJPR1996 , and JSPS KAKENHI Grant No. 19H04408 , Japan. The authors acknowledge the staffs of Analytical Research Core for Advanced Materials (ARCAM), Institute for Materials Research of Tohoku University. Publisher Copyright: {\textcopyright} 2020 Acta Materialia Inc.",

year = "2020",

month = nov,

doi = "10.1016/j.scriptamat.2020.07.005",

language = "English",

volume = "188",

pages = "88--91",

journal = "Scripta Materialia",

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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 - Funding Information: This work was supported by JST, PRESTO Grant Number JPMJPR1996, and JSPS KAKENHI Grant No. 19H04408, Japan. The authors acknowledge the staffs of Analytical Research Core for Advanced Materials (ARCAM), Institute for Materials Research of Tohoku University. Funding Information: This work was supported by JST , PRESTO Grant Number JPMJPR1996 , and JSPS KAKENHI Grant No. 19H04408 , Japan. The authors acknowledge the staffs of Analytical Research Core for Advanced Materials (ARCAM), Institute for Materials Research of Tohoku University. Publisher Copyright: © 2020 Acta Materialia Inc.

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 - Aging

KW - Differential scanning calorimetry (DSC)

KW - Hardness

KW - Internal friction

KW - Titanium alloys

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DO - 10.1016/j.scriptamat.2020.07.005

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AN - SCOPUS:85088116520

SN - 1359-6462

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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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