Oxygen diffusion in Ti3Al single crystals

Y. Koizumi; M. Kishimoto; Y. Minamino; H. Nakajima

doi:10.1080/14786430802419135

Oxygen diffusion in Ti₃Al single crystals

Y. Koizumi, M. Kishimoto, Y. Minamino, H. Nakajima

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

23 Citations (Scopus)

Abstract

Diffusion coefficients of oxygen in directions parallel to the c- (D _c) and a-axis (D_a) of Ti₃Al single crystals were measured by oxygen implantation and Auger electron spectroscopy. The temperature dependence of D_C and D_a in the temperature range 723 - 1073 K is expressed as: D_C =7:3_-2:2 ^+3.1 × 10^-9 exp(-187:3 ± 2:7[kJ/mol]=RT) [m²=s] and D_a = 4:7_2:0^+3.3× 10⁹ exp(-184:8 ± 4:0[kJ/mol]/RT) [m²/s], respectively. The diffusion coefficients are three orders of magnitude less than those in α-Ti. The value of D_C/D_a is within the range 0.94 - 1.11 and the diffusion anisotropy is weak, despite the anisotropic arrangement of octahedral sites. The diffusion mechanism is discussed in terms of the ordered arrangement of two types of octahedral sites occupied by oxygen atoms.

Original language	English
Pages (from-to)	2991-3010
Number of pages	20
Journal	Philosophical Magazine
Volume	88
Issue number	24
DOIs	https://doi.org/10.1080/14786430802419135
Publication status	Published - 2008 Aug
Externally published	Yes

Keywords

Anisotropy
Impurity diffusion
Intermetallic compound
Interstitial
Oxygen
Titanium aluminide

ASJC Scopus subject areas

Condensed Matter Physics

Access to Document

10.1080/14786430802419135

Cite this

@article{486af568e7154617ab36172bd6663f73,

title = "Oxygen diffusion in Ti3Al single crystals",

abstract = "Diffusion coefficients of oxygen in directions parallel to the c- (D c) and a-axis (Da) of Ti3Al single crystals were measured by oxygen implantation and Auger electron spectroscopy. The temperature dependence of DC and Da in the temperature range 723 - 1073 K is expressed as: DC =7:3-2:2 +3.1 × 10-9 exp(-187:3 ± 2:7[kJ/mol]=RT) [m2=s] and Da = 4:72:0+3.3× 109 exp(-184:8 ± 4:0[kJ/mol]/RT) [m2/s], respectively. The diffusion coefficients are three orders of magnitude less than those in α-Ti. The value of DC/Da is within the range 0.94 - 1.11 and the diffusion anisotropy is weak, despite the anisotropic arrangement of octahedral sites. The diffusion mechanism is discussed in terms of the ordered arrangement of two types of octahedral sites occupied by oxygen atoms.",

keywords = "Anisotropy, Impurity diffusion, Intermetallic compound, Interstitial, Oxygen, Titanium aluminide",

author = "Y. Koizumi and M. Kishimoto and Y. Minamino and H. Nakajima",

year = "2008",

month = aug,

doi = "10.1080/14786430802419135",

language = "English",

volume = "88",

pages = "2991--3010",

journal = "Philosophical Magazine",

issn = "1478-6435",

publisher = "Taylor and Francis Ltd.",

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}

TY - JOUR

T1 - Oxygen diffusion in Ti3Al single crystals

AU - Koizumi, Y.

AU - Kishimoto, M.

AU - Minamino, Y.

AU - Nakajima, H.

PY - 2008/8

Y1 - 2008/8

N2 - Diffusion coefficients of oxygen in directions parallel to the c- (D c) and a-axis (Da) of Ti3Al single crystals were measured by oxygen implantation and Auger electron spectroscopy. The temperature dependence of DC and Da in the temperature range 723 - 1073 K is expressed as: DC =7:3-2:2 +3.1 × 10-9 exp(-187:3 ± 2:7[kJ/mol]=RT) [m2=s] and Da = 4:72:0+3.3× 109 exp(-184:8 ± 4:0[kJ/mol]/RT) [m2/s], respectively. The diffusion coefficients are three orders of magnitude less than those in α-Ti. The value of DC/Da is within the range 0.94 - 1.11 and the diffusion anisotropy is weak, despite the anisotropic arrangement of octahedral sites. The diffusion mechanism is discussed in terms of the ordered arrangement of two types of octahedral sites occupied by oxygen atoms.

AB - Diffusion coefficients of oxygen in directions parallel to the c- (D c) and a-axis (Da) of Ti3Al single crystals were measured by oxygen implantation and Auger electron spectroscopy. The temperature dependence of DC and Da in the temperature range 723 - 1073 K is expressed as: DC =7:3-2:2 +3.1 × 10-9 exp(-187:3 ± 2:7[kJ/mol]=RT) [m2=s] and Da = 4:72:0+3.3× 109 exp(-184:8 ± 4:0[kJ/mol]/RT) [m2/s], respectively. The diffusion coefficients are three orders of magnitude less than those in α-Ti. The value of DC/Da is within the range 0.94 - 1.11 and the diffusion anisotropy is weak, despite the anisotropic arrangement of octahedral sites. The diffusion mechanism is discussed in terms of the ordered arrangement of two types of octahedral sites occupied by oxygen atoms.

KW - Anisotropy

KW - Impurity diffusion

KW - Intermetallic compound

KW - Interstitial

KW - Oxygen

KW - Titanium aluminide

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