High temperature strength of α Ti-Al alloys with a locally ordered structure

J. Koike; K. Egashira; K. Maruyama; H. Oikawa

doi:10.1016/0921-5093(96)10227-6

High temperature strength of α Ti-Al alloys with a locally ordered structure

J. Koike, K. Egashira, K. Maruyama, H. Oikawa

ENG - Materials Science

Tohoku University

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

9 Citations (Scopus)

Abstract

Tensile tests were performed in Ti-(7 ∼ 13)mol.%Al alloys at 1100 K. Stress-strain curves showed a large region of constant stress deformation. The results were analyzed by a Dorn type creep equation. The strain rate and the steady-state stress showed anomalous strength of the examined alloys in comparison with the previously reported Ti-(1 ∼ 5)mol.%Al alloys (H. Oikawa and T. Oomori, Mater. Sci. Eng., A104 (1988) 125). Both X-ray diffraction and transmission electron microscopy indicated the appearance of additional diffraction intensities that may owing to the formation of short range ordered (SRO) clusters. The anomalous creep strength observed in the present work seems to be caused by the retardation of dislocation glide by the SRO clusters.

Original language	English
Pages (from-to)	98-102
Number of pages	5
Journal	Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume	213
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-5093(96)10227-6
Publication status	Published - 1996 Aug 15

Keywords

Alpha alloys
Creep
Microstructure
Steady-state deformation
Strength
Ti-Al alloy

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10.1016/0921-5093(96)10227-6

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title = "High temperature strength of α Ti-Al alloys with a locally ordered structure",

abstract = "Tensile tests were performed in Ti-(7 ∼ 13)mol.%Al alloys at 1100 K. Stress-strain curves showed a large region of constant stress deformation. The results were analyzed by a Dorn type creep equation. The strain rate and the steady-state stress showed anomalous strength of the examined alloys in comparison with the previously reported Ti-(1 ∼ 5)mol.%Al alloys (H. Oikawa and T. Oomori, Mater. Sci. Eng., A104 (1988) 125). Both X-ray diffraction and transmission electron microscopy indicated the appearance of additional diffraction intensities that may owing to the formation of short range ordered (SRO) clusters. The anomalous creep strength observed in the present work seems to be caused by the retardation of dislocation glide by the SRO clusters.",

keywords = "Alpha alloys, Creep, Microstructure, Steady-state deformation, Strength, Ti-Al alloy",

author = "J. Koike and K. Egashira and K. Maruyama and H. Oikawa",

note = "Funding Information: The authors acknowledge Dr. H. Fujii at Nippon Steel for providing alloy rods. We also thank Dr. Sato at Tohoku University for Iris technical assistance and fruitful discussion. The work was supported by the Grant-in-Aid for Scientific Research fi'om the Ministry of Education, Science, Sports, and Culture of Japan.",

year = "1996",

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day = "15",

doi = "10.1016/0921-5093(96)10227-6",

language = "English",

volume = "213",

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journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",

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TY - JOUR

T1 - High temperature strength of α Ti-Al alloys with a locally ordered structure

AU - Koike, J.

AU - Egashira, K.

AU - Maruyama, K.

AU - Oikawa, H.

N1 - Funding Information: The authors acknowledge Dr. H. Fujii at Nippon Steel for providing alloy rods. We also thank Dr. Sato at Tohoku University for Iris technical assistance and fruitful discussion. The work was supported by the Grant-in-Aid for Scientific Research fi'om the Ministry of Education, Science, Sports, and Culture of Japan.

PY - 1996/8/15

Y1 - 1996/8/15

N2 - Tensile tests were performed in Ti-(7 ∼ 13)mol.%Al alloys at 1100 K. Stress-strain curves showed a large region of constant stress deformation. The results were analyzed by a Dorn type creep equation. The strain rate and the steady-state stress showed anomalous strength of the examined alloys in comparison with the previously reported Ti-(1 ∼ 5)mol.%Al alloys (H. Oikawa and T. Oomori, Mater. Sci. Eng., A104 (1988) 125). Both X-ray diffraction and transmission electron microscopy indicated the appearance of additional diffraction intensities that may owing to the formation of short range ordered (SRO) clusters. The anomalous creep strength observed in the present work seems to be caused by the retardation of dislocation glide by the SRO clusters.

AB - Tensile tests were performed in Ti-(7 ∼ 13)mol.%Al alloys at 1100 K. Stress-strain curves showed a large region of constant stress deformation. The results were analyzed by a Dorn type creep equation. The strain rate and the steady-state stress showed anomalous strength of the examined alloys in comparison with the previously reported Ti-(1 ∼ 5)mol.%Al alloys (H. Oikawa and T. Oomori, Mater. Sci. Eng., A104 (1988) 125). Both X-ray diffraction and transmission electron microscopy indicated the appearance of additional diffraction intensities that may owing to the formation of short range ordered (SRO) clusters. The anomalous creep strength observed in the present work seems to be caused by the retardation of dislocation glide by the SRO clusters.

KW - Alpha alloys

KW - Creep

KW - Microstructure

KW - Steady-state deformation

KW - Strength

KW - Ti-Al alloy

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U2 - 10.1016/0921-5093(96)10227-6

DO - 10.1016/0921-5093(96)10227-6

M3 - Article

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SN - 0921-5093

VL - 213

SP - 98

EP - 102

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

IS - 1-2

ER -

High temperature strength of α Ti-Al alloys with a locally ordered structure

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Keywords

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