Effect of hydrogen on the microstructural evolution of a γ-TiAl based alloy

Y. Y. Zong; D. S. Wen; Z. Y. Liu; D. B. Shan

doi:10.1016/j.matlet.2014.11.139

Effect of hydrogen on the microstructural evolution of a γ-TiAl based alloy

Y. Y. Zong
, D. S. Wen
, Z. Y. Liu
, D. B. Shan^*

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology

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

18 Scopus citations

Abstract

The effect of hydrogen on the microstructural evolution of a Ti-46Al-2V-1Cr-0.3Ni (in at%) alloy deformed in temperature range 1323-1473 K and strain rate range 0.001-1 s^-1 was investigated. The results show that the extent of lamellar decomposition is higher, and the microstructure is more homogeneous in the hydrogenated alloy than those in the unhydrogenated alloy. More recrystallized grains were observed in the hydrogenated alloy. Hydrogen-promoted lamellar decomposition is mainly attributed to hydrogen-induced lamellar bending, hydrogen-coarsened lamellae and hydrogen-promoted diffusion of elements. Lamellar decomposition, hydrogen-induced twinning and hydrogen-decreased stacking fault energy lead to more dynamic recrystallization. Hydrogen promotes α₂-phase spheroidization and dynamic recovery, which are mainly attributed to hydrogen-promoted diffusion of elements and dislocation movement, respectively.

Original language	English
Pages (from-to)	23-26
Number of pages	4
Journal	Materials Letters
Volume	142
DOIs	https://doi.org/10.1016/j.matlet.2014.11.139
State	Published - 1 Mar 2015

Keywords

Diffusion
Hydrogen
Lamellar decomposition
Recrystallization
γ-TiAl

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10.1016/j.matlet.2014.11.139

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title = "Effect of hydrogen on the microstructural evolution of a γ-TiAl based alloy",

abstract = "The effect of hydrogen on the microstructural evolution of a Ti-46Al-2V-1Cr-0.3Ni (in at\%) alloy deformed in temperature range 1323-1473 K and strain rate range 0.001-1 s-1 was investigated. The results show that the extent of lamellar decomposition is higher, and the microstructure is more homogeneous in the hydrogenated alloy than those in the unhydrogenated alloy. More recrystallized grains were observed in the hydrogenated alloy. Hydrogen-promoted lamellar decomposition is mainly attributed to hydrogen-induced lamellar bending, hydrogen-coarsened lamellae and hydrogen-promoted diffusion of elements. Lamellar decomposition, hydrogen-induced twinning and hydrogen-decreased stacking fault energy lead to more dynamic recrystallization. Hydrogen promotes α2-phase spheroidization and dynamic recovery, which are mainly attributed to hydrogen-promoted diffusion of elements and dislocation movement, respectively.",

keywords = "Diffusion, Hydrogen, Lamellar decomposition, Recrystallization, γ-TiAl",

author = "Zong, \{Y. Y.\} and Wen, \{D. S.\} and Liu, \{Z. Y.\} and Shan, \{D. B.\}",

year = "2015",

month = mar,

day = "1",

doi = "10.1016/j.matlet.2014.11.139",

language = "英语",

volume = "142",

pages = "23--26",

journal = "Materials Letters",

issn = "0167-577X",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Effect of hydrogen on the microstructural evolution of a γ-TiAl based alloy

AU - Zong, Y. Y.

AU - Wen, D. S.

AU - Liu, Z. Y.

AU - Shan, D. B.

PY - 2015/3/1

Y1 - 2015/3/1

N2 - The effect of hydrogen on the microstructural evolution of a Ti-46Al-2V-1Cr-0.3Ni (in at%) alloy deformed in temperature range 1323-1473 K and strain rate range 0.001-1 s-1 was investigated. The results show that the extent of lamellar decomposition is higher, and the microstructure is more homogeneous in the hydrogenated alloy than those in the unhydrogenated alloy. More recrystallized grains were observed in the hydrogenated alloy. Hydrogen-promoted lamellar decomposition is mainly attributed to hydrogen-induced lamellar bending, hydrogen-coarsened lamellae and hydrogen-promoted diffusion of elements. Lamellar decomposition, hydrogen-induced twinning and hydrogen-decreased stacking fault energy lead to more dynamic recrystallization. Hydrogen promotes α2-phase spheroidization and dynamic recovery, which are mainly attributed to hydrogen-promoted diffusion of elements and dislocation movement, respectively.

AB - The effect of hydrogen on the microstructural evolution of a Ti-46Al-2V-1Cr-0.3Ni (in at%) alloy deformed in temperature range 1323-1473 K and strain rate range 0.001-1 s-1 was investigated. The results show that the extent of lamellar decomposition is higher, and the microstructure is more homogeneous in the hydrogenated alloy than those in the unhydrogenated alloy. More recrystallized grains were observed in the hydrogenated alloy. Hydrogen-promoted lamellar decomposition is mainly attributed to hydrogen-induced lamellar bending, hydrogen-coarsened lamellae and hydrogen-promoted diffusion of elements. Lamellar decomposition, hydrogen-induced twinning and hydrogen-decreased stacking fault energy lead to more dynamic recrystallization. Hydrogen promotes α2-phase spheroidization and dynamic recovery, which are mainly attributed to hydrogen-promoted diffusion of elements and dislocation movement, respectively.

KW - Diffusion

KW - Hydrogen

KW - Lamellar decomposition

KW - Recrystallization

KW - γ-TiAl

UR - https://www.scopus.com/pages/publications/84917694456

U2 - 10.1016/j.matlet.2014.11.139

DO - 10.1016/j.matlet.2014.11.139

M3 - 文章

AN - SCOPUS:84917694456

SN - 0167-577X

VL - 142

SP - 23

EP - 26

JO - Materials Letters

JF - Materials Letters

ER -

Effect of hydrogen on the microstructural evolution of a γ-TiAl based alloy

Abstract

Keywords

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