Cyclic deformation and lattice strain distribution of high Nb containing TiAl alloy

Jie Ding; Shan Shi; Zhili Dong; Junpin Lin; Yang Ren; Xiaodong Wu; Hui Chang; Lian Zhou

doi:10.1080/02670836.2020.1795994

Cyclic deformation and lattice strain distribution of high Nb containing TiAl alloy

Jie Ding, Shan Shi, Zhili Dong, Junpin Lin, Yang Ren, Xiaodong Wu^*, Hui Chang, Lian Zhou

^*Corresponding author for this work

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

1 Citation (Scopus)

Abstract

Low cycle fatigue of lamellar TiAl with 8.5 at.-%Nb was studied with a total strain amplitude of 0.28% at three temperatures: room temperature, 750°C and 900°C. At room temperature, the material exhibited cyclic hardening and the fracture mode was mainly interlamellar. At 750°C and 900°C, the material showed cyclic softening and the fracture mode was translamellar. The lattice strain in γ phase was almost tensile and larger tensile lattice strain in γ phase seems detrimental. Besides, the opposite direction of {201}_γ and {100}_α2 lead to crack propagation along α₂/γ interfaces. B2/β_o phase always suffered compressive lattice strain in the tests. The destruction of lamellar microstructure was the reason for colony refinement at 750°C and 900°C.

Original language	English
Pages (from-to)	1507-1515
Number of pages	9
Journal	Metal Science
DOIs	https://doi.org/10.1080/02670836.2020.1795994
Publication status	Published - 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2020, © 2020 Institute of Materials, Minerals and Mining.

ASJC Scopus Subject Areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Keywords

cyclic stress–strain behaviour
fracture behaviour
low cycle fatigue
phase transformation
recrystallization
TiAl alloys

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10.1080/02670836.2020.1795994

Cite this

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title = "Cyclic deformation and lattice strain distribution of high Nb containing TiAl alloy",

abstract = "Low cycle fatigue of lamellar TiAl with 8.5 at.-%Nb was studied with a total strain amplitude of 0.28% at three temperatures: room temperature, 750°C and 900°C. At room temperature, the material exhibited cyclic hardening and the fracture mode was mainly interlamellar. At 750°C and 900°C, the material showed cyclic softening and the fracture mode was translamellar. The lattice strain in γ phase was almost tensile and larger tensile lattice strain in γ phase seems detrimental. Besides, the opposite direction of {201}γ and {100}α2 lead to crack propagation along α2/γ interfaces. B2/βo phase always suffered compressive lattice strain in the tests. The destruction of lamellar microstructure was the reason for colony refinement at 750°C and 900°C.",

keywords = "cyclic stress–strain behaviour, fracture behaviour, low cycle fatigue, phase transformation, recrystallization, TiAl alloys",

author = "Jie Ding and Shan Shi and Zhili Dong and Junpin Lin and Yang Ren and Xiaodong Wu and Hui Chang and Lian Zhou",

note = "Publisher Copyright: {\textcopyright} 2020, {\textcopyright} 2020 Institute of Materials, Minerals and Mining.",

year = "2020",

doi = "10.1080/02670836.2020.1795994",

language = "English",

pages = "1507--1515",

journal = "Metal Science",

issn = "0267-0836",

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TY - JOUR

T1 - Cyclic deformation and lattice strain distribution of high Nb containing TiAl alloy

AU - Ding, Jie

AU - Shi, Shan

AU - Dong, Zhili

AU - Lin, Junpin

AU - Ren, Yang

AU - Wu, Xiaodong

AU - Chang, Hui

AU - Zhou, Lian

PY - 2020

Y1 - 2020

N2 - Low cycle fatigue of lamellar TiAl with 8.5 at.-%Nb was studied with a total strain amplitude of 0.28% at three temperatures: room temperature, 750°C and 900°C. At room temperature, the material exhibited cyclic hardening and the fracture mode was mainly interlamellar. At 750°C and 900°C, the material showed cyclic softening and the fracture mode was translamellar. The lattice strain in γ phase was almost tensile and larger tensile lattice strain in γ phase seems detrimental. Besides, the opposite direction of {201}γ and {100}α2 lead to crack propagation along α2/γ interfaces. B2/βo phase always suffered compressive lattice strain in the tests. The destruction of lamellar microstructure was the reason for colony refinement at 750°C and 900°C.

AB - Low cycle fatigue of lamellar TiAl with 8.5 at.-%Nb was studied with a total strain amplitude of 0.28% at three temperatures: room temperature, 750°C and 900°C. At room temperature, the material exhibited cyclic hardening and the fracture mode was mainly interlamellar. At 750°C and 900°C, the material showed cyclic softening and the fracture mode was translamellar. The lattice strain in γ phase was almost tensile and larger tensile lattice strain in γ phase seems detrimental. Besides, the opposite direction of {201}γ and {100}α2 lead to crack propagation along α2/γ interfaces. B2/βo phase always suffered compressive lattice strain in the tests. The destruction of lamellar microstructure was the reason for colony refinement at 750°C and 900°C.

KW - cyclic stress–strain behaviour

KW - fracture behaviour

KW - low cycle fatigue

KW - phase transformation

KW - recrystallization

KW - TiAl alloys

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DO - 10.1080/02670836.2020.1795994

M3 - Article

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SN - 0267-0836

SP - 1507

EP - 1515

JO - Metal Science

JF - Metal Science

ER -

Cyclic deformation and lattice strain distribution of high Nb containing TiAl alloy

Abstract

Bibliographical note

ASJC Scopus Subject Areas

Keywords

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