Dynamic softening behavior and microstructural characterization of TiAl-based alloy during hot deformation

Zhipeng Wan; Yu Sun; Lianxi Hu; Huan Yu

doi:10.1016/j.matchar.2017.05.022

Dynamic softening behavior and microstructural characterization of TiAl-based alloy during hot deformation

Zhipeng Wan
, Yu Sun^*
, Lianxi Hu
, Huan Yu

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology

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

59 Scopus citations

Abstract

In the present study, the work-softening transient behavior of a powder metallurgy Ti-47Al-2Nb-2Cr alloy during hot deformation, along with microstructure characterization under a temperature of 950–1150 °C and a broad range of strain rates encompassing 0.001–0.1 s^{− 1}, has been investigated. The single peak characteristic, which appeared in all the true stress-strain curves, indicates that DRX is a dominating softening mechanism. Furthermore, it was found that grain boundary bulging played a primary role in the DRX nucleation mechanism through observation of the microstructure evolution. The DRX critical strain occurs at ε_c ≅ 0.73ε_p and the peak strain has been expressed through the Zener-Hollomon parameter. A mathematic model based on the Avrami equation has been established to describe the DRX behavior of the alloy, with the volume fractions of DRX grains calculated by the model in good agreement to that of the experimental results.

Original language	English
Pages (from-to)	25-32
Number of pages	8
Journal	Materials Characterization
Volume	130
DOIs	https://doi.org/10.1016/j.matchar.2017.05.022
State	Published - Aug 2017

Keywords

Avrami equation
Critical strain model
Dynamic recrystallization
Ti-47Al-2Nb-2Cr alloy

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10.1016/j.matchar.2017.05.022

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title = "Dynamic softening behavior and microstructural characterization of TiAl-based alloy during hot deformation",

abstract = "In the present study, the work-softening transient behavior of a powder metallurgy Ti-47Al-2Nb-2Cr alloy during hot deformation, along with microstructure characterization under a temperature of 950–1150 °C and a broad range of strain rates encompassing 0.001–0.1 s− 1, has been investigated. The single peak characteristic, which appeared in all the true stress-strain curves, indicates that DRX is a dominating softening mechanism. Furthermore, it was found that grain boundary bulging played a primary role in the DRX nucleation mechanism through observation of the microstructure evolution. The DRX critical strain occurs at εc ≅ 0.73εp and the peak strain has been expressed through the Zener-Hollomon parameter. A mathematic model based on the Avrami equation has been established to describe the DRX behavior of the alloy, with the volume fractions of DRX grains calculated by the model in good agreement to that of the experimental results.",

keywords = "Avrami equation, Critical strain model, Dynamic recrystallization, Ti-47Al-2Nb-2Cr alloy",

author = "Zhipeng Wan and Yu Sun and Lianxi Hu and Huan Yu",

note = "Publisher Copyright: {\textcopyright} 2017",

year = "2017",

month = aug,

doi = "10.1016/j.matchar.2017.05.022",

language = "英语",

volume = "130",

pages = "25--32",

journal = "Materials Characterization",

issn = "1044-5803",

publisher = "Elsevier Inc.",

}

TY - JOUR

T1 - Dynamic softening behavior and microstructural characterization of TiAl-based alloy during hot deformation

AU - Wan, Zhipeng

AU - Sun, Yu

AU - Hu, Lianxi

AU - Yu, Huan

PY - 2017/8

Y1 - 2017/8

N2 - In the present study, the work-softening transient behavior of a powder metallurgy Ti-47Al-2Nb-2Cr alloy during hot deformation, along with microstructure characterization under a temperature of 950–1150 °C and a broad range of strain rates encompassing 0.001–0.1 s− 1, has been investigated. The single peak characteristic, which appeared in all the true stress-strain curves, indicates that DRX is a dominating softening mechanism. Furthermore, it was found that grain boundary bulging played a primary role in the DRX nucleation mechanism through observation of the microstructure evolution. The DRX critical strain occurs at εc ≅ 0.73εp and the peak strain has been expressed through the Zener-Hollomon parameter. A mathematic model based on the Avrami equation has been established to describe the DRX behavior of the alloy, with the volume fractions of DRX grains calculated by the model in good agreement to that of the experimental results.

AB - In the present study, the work-softening transient behavior of a powder metallurgy Ti-47Al-2Nb-2Cr alloy during hot deformation, along with microstructure characterization under a temperature of 950–1150 °C and a broad range of strain rates encompassing 0.001–0.1 s− 1, has been investigated. The single peak characteristic, which appeared in all the true stress-strain curves, indicates that DRX is a dominating softening mechanism. Furthermore, it was found that grain boundary bulging played a primary role in the DRX nucleation mechanism through observation of the microstructure evolution. The DRX critical strain occurs at εc ≅ 0.73εp and the peak strain has been expressed through the Zener-Hollomon parameter. A mathematic model based on the Avrami equation has been established to describe the DRX behavior of the alloy, with the volume fractions of DRX grains calculated by the model in good agreement to that of the experimental results.

KW - Avrami equation

KW - Critical strain model

KW - Dynamic recrystallization

KW - Ti-47Al-2Nb-2Cr alloy

UR - https://www.scopus.com/pages/publications/85019586710

U2 - 10.1016/j.matchar.2017.05.022

DO - 10.1016/j.matchar.2017.05.022

M3 - 文章

AN - SCOPUS:85019586710

SN - 1044-5803

VL - 130

SP - 25

EP - 32

JO - Materials Characterization

JF - Materials Characterization

ER -

Dynamic softening behavior and microstructural characterization of TiAl-based alloy during hot deformation

Abstract

Keywords

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