Low-temperature superplasticity of forged Ti-43Al-4Nb-2Mo-0.5B alloy

H. Z. Niu; F. T. Kong; Y. Y. Chen; C. J. Zhang

doi:10.1016/j.jallcom.2012.07.127

Low-temperature superplasticity of forged Ti-43Al-4Nb-2Mo-0.5B alloy

H. Z. Niu
, F. T. Kong
, Y. Y. Chen^*
, C. J. Zhang

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology

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

44 Scopus citations

Abstract

The forged Ti-43Al-4Nb-2Mo-0.5B (at.%) alloy exhibits remarkable low-temperature superplasticity between 900 and 950 °C in strain rate range 1.0 × 10 ^-4 - 4.0 × 10 ^-4 s ^-1. A maximum elongation of 405% was obtained at 950 °C with strain rate sensitivity index (m) 0.52. This excellent superplasticity is ascribed to fine-grained microstructure containing soft β phase. Dynamic recrystallization and lamellar (α ₂/γ) structure decomposition during tensile straining contribute to superplastic deformation. Microstructure evolution and cavity development were studied by means of SEM, TEM, EBSD and XRD techniques. It was found that dynamic recrystallization and lamellar (α ₂/γ) structure decomposition took place prior to cavity formation. The formation of cavity stringers and their transverse coalescence resulted in the failure of superplastic deformation.

Original language	English
Pages (from-to)	19-25
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	543
DOIs	https://doi.org/10.1016/j.jallcom.2012.07.127
State	Published - 5 Dec 2012

Keywords

Intermetallics
Mechanical properties
Microstructure

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10.1016/j.jallcom.2012.07.127

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@article{3c17cf99bcbf4dbd803d7aa263dcfbc1,

title = "Low-temperature superplasticity of forged Ti-43Al-4Nb-2Mo-0.5B alloy",

abstract = "The forged Ti-43Al-4Nb-2Mo-0.5B (at.\%) alloy exhibits remarkable low-temperature superplasticity between 900 and 950 °C in strain rate range 1.0 × 10 -4 - 4.0 × 10 -4 s -1. A maximum elongation of 405\% was obtained at 950 °C with strain rate sensitivity index (m) 0.52. This excellent superplasticity is ascribed to fine-grained microstructure containing soft β phase. Dynamic recrystallization and lamellar (α 2/γ) structure decomposition during tensile straining contribute to superplastic deformation. Microstructure evolution and cavity development were studied by means of SEM, TEM, EBSD and XRD techniques. It was found that dynamic recrystallization and lamellar (α 2/γ) structure decomposition took place prior to cavity formation. The formation of cavity stringers and their transverse coalescence resulted in the failure of superplastic deformation.",

keywords = "Intermetallics, Mechanical properties, Microstructure",

author = "Niu, \{H. Z.\} and Kong, \{F. T.\} and Chen, \{Y. Y.\} and Zhang, \{C. J.\}",

year = "2012",

month = dec,

day = "5",

doi = "10.1016/j.jallcom.2012.07.127",

language = "英语",

volume = "543",

pages = "19--25",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Low-temperature superplasticity of forged Ti-43Al-4Nb-2Mo-0.5B alloy

AU - Niu, H. Z.

AU - Kong, F. T.

AU - Chen, Y. Y.

AU - Zhang, C. J.

PY - 2012/12/5

Y1 - 2012/12/5

N2 - The forged Ti-43Al-4Nb-2Mo-0.5B (at.%) alloy exhibits remarkable low-temperature superplasticity between 900 and 950 °C in strain rate range 1.0 × 10 -4 - 4.0 × 10 -4 s -1. A maximum elongation of 405% was obtained at 950 °C with strain rate sensitivity index (m) 0.52. This excellent superplasticity is ascribed to fine-grained microstructure containing soft β phase. Dynamic recrystallization and lamellar (α 2/γ) structure decomposition during tensile straining contribute to superplastic deformation. Microstructure evolution and cavity development were studied by means of SEM, TEM, EBSD and XRD techniques. It was found that dynamic recrystallization and lamellar (α 2/γ) structure decomposition took place prior to cavity formation. The formation of cavity stringers and their transverse coalescence resulted in the failure of superplastic deformation.

AB - The forged Ti-43Al-4Nb-2Mo-0.5B (at.%) alloy exhibits remarkable low-temperature superplasticity between 900 and 950 °C in strain rate range 1.0 × 10 -4 - 4.0 × 10 -4 s -1. A maximum elongation of 405% was obtained at 950 °C with strain rate sensitivity index (m) 0.52. This excellent superplasticity is ascribed to fine-grained microstructure containing soft β phase. Dynamic recrystallization and lamellar (α 2/γ) structure decomposition during tensile straining contribute to superplastic deformation. Microstructure evolution and cavity development were studied by means of SEM, TEM, EBSD and XRD techniques. It was found that dynamic recrystallization and lamellar (α 2/γ) structure decomposition took place prior to cavity formation. The formation of cavity stringers and their transverse coalescence resulted in the failure of superplastic deformation.

KW - Intermetallics

KW - Mechanical properties

KW - Microstructure

UR - https://www.scopus.com/pages/publications/84865823774

U2 - 10.1016/j.jallcom.2012.07.127

DO - 10.1016/j.jallcom.2012.07.127

M3 - 文章

AN - SCOPUS:84865823774

SN - 0925-8388

VL - 543

SP - 19

EP - 25

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Low-temperature superplasticity of forged Ti-43Al-4Nb-2Mo-0.5B alloy

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Keywords

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