Creep properties of Ti–48Al–2Cr–2Nb alloy having similarly oriented lamellae with fine lamellar spacing

Zhizhou Xia; Ronghua Liu; Yingying Shen; Arroussi Mohammed; Qing Jia; Yuyou Cui; Rui Yang

doi:10.1016/j.msea.2022.144362

Creep properties of Ti–48Al–2Cr–2Nb alloy having similarly oriented lamellae with fine lamellar spacing

Zhizhou Xia
, Ronghua Liu
, Yingying Shen
, Arroussi Mohammed
, Qing Jia
, Yuyou Cui^*
, Rui Yang^*

^*Corresponding author for this work

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

18 Scopus citations

Abstract

The tensile creep behavior of suction-cast and heat-treated Ti–48Al–2Cr–2Nb (at. pct., SC4822) alloy featuring aligned lamellar microstructure with fine lamellae was investigated. The alloy showed excellent creep performance in the temperature range of 775–825 °C under applied stresses varying from 200 to 350 MPa. The creep properties of SC4822 alloy greatly outperformed that of several other typical TiAl alloys with randomly oriented lamellae. The stress exponent (n) for SC4822 alloy was calculated to be 5.1 at 800 °C under different stresses, whereas the apparent activation energy (Q_C) was found to be 397.18 kJ/mol under 300 MPa at different temperatures. This suggested that creep deformation was dominantly controlled by dislocation climb, as confirmed by subsequent microstructure observation. Besides, dynamic recrystallization, twinning and slipping were also found to contribute to the deformation of creep.

Original language	English
Article number	144362
Journal	Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume	861
DOIs	https://doi.org/10.1016/j.msea.2022.144362
State	Published - 19 Dec 2022
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2022

Keywords

Creep properties
Fracture behavior
Lamellar spacing
Oriented lamellae
TiAl alloy

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.msea.2022.144362

Cite this

@article{2f199aa0e0a94117946b9e9b0c5b59b6,

title = "Creep properties of Ti–48Al–2Cr–2Nb alloy having similarly oriented lamellae with fine lamellar spacing",

abstract = "The tensile creep behavior of suction-cast and heat-treated Ti–48Al–2Cr–2Nb (at. pct., SC4822) alloy featuring aligned lamellar microstructure with fine lamellae was investigated. The alloy showed excellent creep performance in the temperature range of 775–825 °C under applied stresses varying from 200 to 350 MPa. The creep properties of SC4822 alloy greatly outperformed that of several other typical TiAl alloys with randomly oriented lamellae. The stress exponent (n) for SC4822 alloy was calculated to be 5.1 at 800 °C under different stresses, whereas the apparent activation energy (QC) was found to be 397.18 kJ/mol under 300 MPa at different temperatures. This suggested that creep deformation was dominantly controlled by dislocation climb, as confirmed by subsequent microstructure observation. Besides, dynamic recrystallization, twinning and slipping were also found to contribute to the deformation of creep.",

keywords = "Creep properties, Fracture behavior, Lamellar spacing, Oriented lamellae, TiAl alloy",

author = "Zhizhou Xia and Ronghua Liu and Yingying Shen and Arroussi Mohammed and Qing Jia and Yuyou Cui and Rui Yang",

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2022",

month = dec,

day = "19",

doi = "10.1016/j.msea.2022.144362",

language = "English",

volume = "861",

journal = "Materials Science \& Engineering A: Structural Materials: Properties, Microstructure and Processing",

issn = "0921-5093",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Creep properties of Ti–48Al–2Cr–2Nb alloy having similarly oriented lamellae with fine lamellar spacing

AU - Xia, Zhizhou

AU - Liu, Ronghua

AU - Shen, Yingying

AU - Mohammed, Arroussi

AU - Jia, Qing

AU - Cui, Yuyou

AU - Yang, Rui

PY - 2022/12/19

Y1 - 2022/12/19

N2 - The tensile creep behavior of suction-cast and heat-treated Ti–48Al–2Cr–2Nb (at. pct., SC4822) alloy featuring aligned lamellar microstructure with fine lamellae was investigated. The alloy showed excellent creep performance in the temperature range of 775–825 °C under applied stresses varying from 200 to 350 MPa. The creep properties of SC4822 alloy greatly outperformed that of several other typical TiAl alloys with randomly oriented lamellae. The stress exponent (n) for SC4822 alloy was calculated to be 5.1 at 800 °C under different stresses, whereas the apparent activation energy (QC) was found to be 397.18 kJ/mol under 300 MPa at different temperatures. This suggested that creep deformation was dominantly controlled by dislocation climb, as confirmed by subsequent microstructure observation. Besides, dynamic recrystallization, twinning and slipping were also found to contribute to the deformation of creep.

AB - The tensile creep behavior of suction-cast and heat-treated Ti–48Al–2Cr–2Nb (at. pct., SC4822) alloy featuring aligned lamellar microstructure with fine lamellae was investigated. The alloy showed excellent creep performance in the temperature range of 775–825 °C under applied stresses varying from 200 to 350 MPa. The creep properties of SC4822 alloy greatly outperformed that of several other typical TiAl alloys with randomly oriented lamellae. The stress exponent (n) for SC4822 alloy was calculated to be 5.1 at 800 °C under different stresses, whereas the apparent activation energy (QC) was found to be 397.18 kJ/mol under 300 MPa at different temperatures. This suggested that creep deformation was dominantly controlled by dislocation climb, as confirmed by subsequent microstructure observation. Besides, dynamic recrystallization, twinning and slipping were also found to contribute to the deformation of creep.

KW - Creep properties

KW - Fracture behavior

KW - Lamellar spacing

KW - Oriented lamellae

KW - TiAl alloy

UR - https://www.scopus.com/pages/publications/85142383519

U2 - 10.1016/j.msea.2022.144362

DO - 10.1016/j.msea.2022.144362

M3 - Article

AN - SCOPUS:85142383519

SN - 0921-5093

VL - 861

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

M1 - 144362

ER -

Creep properties of Ti–48Al–2Cr–2Nb alloy having similarly oriented lamellae with fine lamellar spacing

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

Fingerprint

Cite this