High Temperature Mechanical Behavior of Ti-45Al-8Nb and Its Cavity Evolution in Deformation

Zhihao Du; Kaifeng Zhang; Shaosong Jiang; Ruican Zhu; Shuguang Li

doi:10.1007/s11665-015-1676-x

High Temperature Mechanical Behavior of Ti-45Al-8Nb and Its Cavity Evolution in Deformation

Zhihao Du^*
, Kaifeng Zhang
, Shaosong Jiang
, Ruican Zhu
, Shuguang Li

^*Corresponding author for this work

Harbin Institute of Technology
Capital Spaceflight Machinery Company

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

13 Scopus citations

Abstract

The tensile property of a high Nb containing TiAl-based alloy (Ti-45Al-8Nb) was investigated in the temperature range of 900-1050 °C and strain rate range of 1 × 10⁻³ to 2.5 × 10⁻² s⁻¹. The results revealed that the yield stress decreased with increasing temperature and decreasing strain rate, while the tensile elongation increased with an increase in temperature and a decrease in strain rate. Hence, The minimum yield stress of 119.2 MPa and the maximum elongation of 237% were obtained at the temperature of 1050 °C and strain rate of 1 × 10⁻³ s⁻¹. Based on the experimental data, the activation energy of the alloy was calculated to be 360 kJ/mol. Moreover, the microstructure and the fracture morphology of the specimens were observed, and the results revealed that the distribution of cavities was related to deformation parameters and the fracture mode was typically dimple-type.

Original language	English
Pages (from-to)	3746-3754
Number of pages	9
Journal	Journal of Materials Engineering and Performance
Volume	24
Issue number	10
DOIs	https://doi.org/10.1007/s11665-015-1676-x
State	Published - 1 Oct 2015
Externally published	Yes

Keywords

TiAl alloy
cavity evolution
constitutive model
fracture morphology
mechanical behavior

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10.1007/s11665-015-1676-x

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@article{8c64639354b14fd3801e638117875b2f,

title = "High Temperature Mechanical Behavior of Ti-45Al-8Nb and Its Cavity Evolution in Deformation",

abstract = "The tensile property of a high Nb containing TiAl-based alloy (Ti-45Al-8Nb) was investigated in the temperature range of 900-1050 °C and strain rate range of 1 × 10−3 to 2.5 × 10−2 s−1. The results revealed that the yield stress decreased with increasing temperature and decreasing strain rate, while the tensile elongation increased with an increase in temperature and a decrease in strain rate. Hence, The minimum yield stress of 119.2 MPa and the maximum elongation of 237\% were obtained at the temperature of 1050 °C and strain rate of 1 × 10−3 s−1. Based on the experimental data, the activation energy of the alloy was calculated to be 360 kJ/mol. Moreover, the microstructure and the fracture morphology of the specimens were observed, and the results revealed that the distribution of cavities was related to deformation parameters and the fracture mode was typically dimple-type.",

keywords = "TiAl alloy, cavity evolution, constitutive model, fracture morphology, mechanical behavior",

author = "Zhihao Du and Kaifeng Zhang and Shaosong Jiang and Ruican Zhu and Shuguang Li",

note = "Publisher Copyright: {\textcopyright} 2015, ASM International.",

year = "2015",

month = oct,

day = "1",

doi = "10.1007/s11665-015-1676-x",

language = "英语",

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pages = "3746--3754",

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}

TY - JOUR

T1 - High Temperature Mechanical Behavior of Ti-45Al-8Nb and Its Cavity Evolution in Deformation

AU - Du, Zhihao

AU - Zhang, Kaifeng

AU - Jiang, Shaosong

AU - Zhu, Ruican

AU - Li, Shuguang

PY - 2015/10/1

Y1 - 2015/10/1

N2 - The tensile property of a high Nb containing TiAl-based alloy (Ti-45Al-8Nb) was investigated in the temperature range of 900-1050 °C and strain rate range of 1 × 10−3 to 2.5 × 10−2 s−1. The results revealed that the yield stress decreased with increasing temperature and decreasing strain rate, while the tensile elongation increased with an increase in temperature and a decrease in strain rate. Hence, The minimum yield stress of 119.2 MPa and the maximum elongation of 237% were obtained at the temperature of 1050 °C and strain rate of 1 × 10−3 s−1. Based on the experimental data, the activation energy of the alloy was calculated to be 360 kJ/mol. Moreover, the microstructure and the fracture morphology of the specimens were observed, and the results revealed that the distribution of cavities was related to deformation parameters and the fracture mode was typically dimple-type.

AB - The tensile property of a high Nb containing TiAl-based alloy (Ti-45Al-8Nb) was investigated in the temperature range of 900-1050 °C and strain rate range of 1 × 10−3 to 2.5 × 10−2 s−1. The results revealed that the yield stress decreased with increasing temperature and decreasing strain rate, while the tensile elongation increased with an increase in temperature and a decrease in strain rate. Hence, The minimum yield stress of 119.2 MPa and the maximum elongation of 237% were obtained at the temperature of 1050 °C and strain rate of 1 × 10−3 s−1. Based on the experimental data, the activation energy of the alloy was calculated to be 360 kJ/mol. Moreover, the microstructure and the fracture morphology of the specimens were observed, and the results revealed that the distribution of cavities was related to deformation parameters and the fracture mode was typically dimple-type.

KW - TiAl alloy

KW - cavity evolution

KW - constitutive model

KW - fracture morphology

KW - mechanical behavior

UR - https://www.scopus.com/pages/publications/84942980774

U2 - 10.1007/s11665-015-1676-x

DO - 10.1007/s11665-015-1676-x

M3 - 文章

AN - SCOPUS:84942980774

SN - 1059-9495

VL - 24

SP - 3746

EP - 3754

JO - Journal of Materials Engineering and Performance

JF - Journal of Materials Engineering and Performance

IS - 10

ER -

High Temperature Mechanical Behavior of Ti-45Al-8Nb and Its Cavity Evolution in Deformation

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Keywords

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