Microstructure refinement assisted by α-recrystallization in a peritectic TiAl alloy

Jieren Yang; Zitong Gao; Yongfeng Liang; Yulun Wu; Jinguang Li; Rui Hu

doi:10.1016/j.jmrt.2021.01.073

Microstructure refinement assisted by α-recrystallization in a peritectic TiAl alloy

Jieren Yang, Zitong Gao, Yongfeng Liang, Yulun Wu, Jinguang Li, Rui Hu

School of Materials Sience and Engineering

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

12 Scopus citations

Abstract

Fine-grained nearly-lamellar (FGNL) microstructures and ultrafine α₂/γ lamellar microstructure were successfully obtained by means of α-recrystallization in a Ti–48Al–2Nb–2Cr alloy. The dynamic recrystallization of α phases and subsequent cooling control contributed to microstructure refinements, which were governed by small-strain α-deformation. Lamellar grain refinement is due to dominating continuous dynamic recrystallization (CDRX). Lamellar structure refinement is mainly achieved by the increase in γ lamellae precipitation sites by α-deformation and fast cooling. Finally, the microstructure evolution and control mechanisms were illustrated, suggesting a promising method for improving the mechanical properties of TiAl alloy.

Original language	English
Pages (from-to)	1135-1141
Number of pages	7
Journal	Journal of Materials Research and Technology
Volume	11
DOIs	https://doi.org/10.1016/j.jmrt.2021.01.073
State	Published - 1 Mar 2021

Keywords

Continuous dynamic recrystallization
Microstructure refinement
Phase transformation
Titanium aluminides
α-Processing

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10.1016/j.jmrt.2021.01.073

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title = "Microstructure refinement assisted by α-recrystallization in a peritectic TiAl alloy",

abstract = "Fine-grained nearly-lamellar (FGNL) microstructures and ultrafine α2/γ lamellar microstructure were successfully obtained by means of α-recrystallization in a Ti–48Al–2Nb–2Cr alloy. The dynamic recrystallization of α phases and subsequent cooling control contributed to microstructure refinements, which were governed by small-strain α-deformation. Lamellar grain refinement is due to dominating continuous dynamic recrystallization (CDRX). Lamellar structure refinement is mainly achieved by the increase in γ lamellae precipitation sites by α-deformation and fast cooling. Finally, the microstructure evolution and control mechanisms were illustrated, suggesting a promising method for improving the mechanical properties of TiAl alloy.",

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author = "Jieren Yang and Zitong Gao and Yongfeng Liang and Yulun Wu and Jinguang Li and Rui Hu",

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T1 - Microstructure refinement assisted by α-recrystallization in a peritectic TiAl alloy

AU - Yang, Jieren

AU - Gao, Zitong

AU - Liang, Yongfeng

AU - Wu, Yulun

AU - Li, Jinguang

AU - Hu, Rui

PY - 2021/3/1

Y1 - 2021/3/1

N2 - Fine-grained nearly-lamellar (FGNL) microstructures and ultrafine α2/γ lamellar microstructure were successfully obtained by means of α-recrystallization in a Ti–48Al–2Nb–2Cr alloy. The dynamic recrystallization of α phases and subsequent cooling control contributed to microstructure refinements, which were governed by small-strain α-deformation. Lamellar grain refinement is due to dominating continuous dynamic recrystallization (CDRX). Lamellar structure refinement is mainly achieved by the increase in γ lamellae precipitation sites by α-deformation and fast cooling. Finally, the microstructure evolution and control mechanisms were illustrated, suggesting a promising method for improving the mechanical properties of TiAl alloy.

AB - Fine-grained nearly-lamellar (FGNL) microstructures and ultrafine α2/γ lamellar microstructure were successfully obtained by means of α-recrystallization in a Ti–48Al–2Nb–2Cr alloy. The dynamic recrystallization of α phases and subsequent cooling control contributed to microstructure refinements, which were governed by small-strain α-deformation. Lamellar grain refinement is due to dominating continuous dynamic recrystallization (CDRX). Lamellar structure refinement is mainly achieved by the increase in γ lamellae precipitation sites by α-deformation and fast cooling. Finally, the microstructure evolution and control mechanisms were illustrated, suggesting a promising method for improving the mechanical properties of TiAl alloy.

KW - Continuous dynamic recrystallization

KW - Microstructure refinement

KW - Phase transformation

KW - Titanium aluminides

KW - α-Processing

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U2 - 10.1016/j.jmrt.2021.01.073

DO - 10.1016/j.jmrt.2021.01.073

M3 - 文章

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SN - 2238-7854

VL - 11

SP - 1135

EP - 1141

JO - Journal of Materials Research and Technology

JF - Journal of Materials Research and Technology

ER -

Microstructure refinement assisted by α-recrystallization in a peritectic TiAl alloy

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