Elevated-temperature environmental embrittlement and alloy design of L12 ordered intermetallics

M. Takeyama; C. T. Liu

doi:10.1016/b978-1-85166-822-9.50086-8

Elevated-temperature environmental embrittlement and alloy design of L1₂ ordered intermetallics

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

Abstract

Ordered intermetallic alloys with L1₂ crystal structure such as Ni₃Al and Ni₃Si exhibit environmental embrittlement with much lower ductilities in air than in vacuum when being tested at elevated temperatures. The environmental embrittlement is sensitive to test temperature, alloy composition and grain geometry. The embrittling behavior at elevated temperatures is a dynamic phenomenon, i.e. gaseous oxygen in test environments is chemically absorbed at the tip of cracks induced on alloy surfaces by deformation and then drives into the metal along grain boundaries, leading to a reduction of the grain boundary cohesion. The embrittlement can be alleviated by formation of protective oxide films on alloy surfaces, control of grain shape or addition of beneficial elements such as chromium. In contrast, ordered inter-metallics based on b.c.c. crystal structures such as FeAl(B2) and Fe₃Al(D0₃) do not show environmental embrittlement at elevated temperatures. The embrittling behavior as well as alloy design to alleviate the embrittlement is discussed in this papaer. (A)

Original language	English
Title of host publication	High Temperature Aluminides and Intermetallics
Subtitle of host publication	Proceedings of the Second International ASM Conference on High Temperature Aluminides and Intermetallics, September 16–19, 1991, San Diego, CA, USA
Editors	S.H. WHANG, D.P. POPE, C.T. LIU
Publisher	Elsevier
Pages	538-547
ISBN (Print)	9781851668229
DOIs	https://doi.org/10.1016/b978-1-85166-822-9.50086-8
Publication status	Published - 1992
Externally published	Yes
Event	2nd International ASM Conference on High Temperature Aluminides and Intermetallics - San Diego, United States Duration: 16 Sept 1991 → 19 Sept 1991

Publication series

Name	Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ISSN (Print)	0921-5093

Conference

Conference	2nd International ASM Conference on High Temperature Aluminides and Intermetallics
Place	United States
City	San Diego
Period	16/09/91 → 19/09/91

Bibliographical note

The publication is also published in "Materials Science and Engineering A".

Access Output

10.1016/b978-1-85166-822-9.50086-8

Other Access Options

Check CityUHK Library

Permanent Link

Right click to copy link

Cite this

Takeyama, M., & Liu, C. T. (1992). Elevated-temperature environmental embrittlement and alloy design of L1₂ ordered intermetallics. In S. H. WHANG, D. P. POPE, & C. T. LIU (Eds.), High Temperature Aluminides and Intermetallics: Proceedings of the Second International ASM Conference on High Temperature Aluminides and Intermetallics, September 16–19, 1991, San Diego, CA, USA (pp. 538-547). (Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing). Elsevier. https://doi.org/10.1016/b978-1-85166-822-9.50086-8

Takeyama, M. ; Liu, C. T. / Elevated-temperature environmental embrittlement and alloy design of L1₂ ordered intermetallics. High Temperature Aluminides and Intermetallics: Proceedings of the Second International ASM Conference on High Temperature Aluminides and Intermetallics, September 16–19, 1991, San Diego, CA, USA. editor / S.H. WHANG ; D.P. POPE ; C.T. LIU. Elsevier, 1992. pp. 538-547 (Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing).

@inproceedings{b3feb4b828b340b592b51b58ff629bd2,

title = "Elevated-temperature environmental embrittlement and alloy design of L12 ordered intermetallics",

abstract = "Ordered intermetallic alloys with L12 crystal structure such as Ni3Al and Ni3Si exhibit environmental embrittlement with much lower ductilities in air than in vacuum when being tested at elevated temperatures. The environmental embrittlement is sensitive to test temperature, alloy composition and grain geometry. The embrittling behavior at elevated temperatures is a dynamic phenomenon, i.e. gaseous oxygen in test environments is chemically absorbed at the tip of cracks induced on alloy surfaces by deformation and then drives into the metal along grain boundaries, leading to a reduction of the grain boundary cohesion. The embrittlement can be alleviated by formation of protective oxide films on alloy surfaces, control of grain shape or addition of beneficial elements such as chromium. In contrast, ordered inter-metallics based on b.c.c. crystal structures such as FeAl(B2) and Fe3Al(D03) do not show environmental embrittlement at elevated temperatures. The embrittling behavior as well as alloy design to alleviate the embrittlement is discussed in this papaer. (A)",

author = "M. Takeyama and Liu, {C. T.}",

note = "The publication is also published in {"}Materials Science and Engineering A{"}.; 2nd International ASM Conference on High Temperature Aluminides and Intermetallics ; Conference date: 16-09-1991 Through 19-09-1991",

year = "1992",

doi = "10.1016/b978-1-85166-822-9.50086-8",

language = "English",

isbn = "9781851668229",

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

publisher = "Elsevier",

pages = "538--547",

editor = "S.H. WHANG and D.P. POPE and C.T. LIU",

booktitle = "High Temperature Aluminides and Intermetallics",

}

Takeyama, M & Liu, CT 1992, Elevated-temperature environmental embrittlement and alloy design of L1₂ ordered intermetallics. in SH WHANG, DP POPE & CT LIU (eds), High Temperature Aluminides and Intermetallics: Proceedings of the Second International ASM Conference on High Temperature Aluminides and Intermetallics, September 16–19, 1991, San Diego, CA, USA. Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, Elsevier, pp. 538-547, 2nd International ASM Conference on High Temperature Aluminides and Intermetallics, San Diego, California, United States, 16/09/91. https://doi.org/10.1016/b978-1-85166-822-9.50086-8

Elevated-temperature environmental embrittlement and alloy design of L1₂ ordered intermetallics. / Takeyama, M.; Liu, C. T.
High Temperature Aluminides and Intermetallics: Proceedings of the Second International ASM Conference on High Temperature Aluminides and Intermetallics, September 16–19, 1991, San Diego, CA, USA. ed. / S.H. WHANG; D.P. POPE; C.T. LIU. Elsevier, 1992. p. 538-547 (Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing).

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

TY - GEN

T1 - Elevated-temperature environmental embrittlement and alloy design of L12 ordered intermetallics

AU - Takeyama, M.

AU - Liu, C. T.

N1 - The publication is also published in "Materials Science and Engineering A".

PY - 1992

Y1 - 1992

N2 - Ordered intermetallic alloys with L12 crystal structure such as Ni3Al and Ni3Si exhibit environmental embrittlement with much lower ductilities in air than in vacuum when being tested at elevated temperatures. The environmental embrittlement is sensitive to test temperature, alloy composition and grain geometry. The embrittling behavior at elevated temperatures is a dynamic phenomenon, i.e. gaseous oxygen in test environments is chemically absorbed at the tip of cracks induced on alloy surfaces by deformation and then drives into the metal along grain boundaries, leading to a reduction of the grain boundary cohesion. The embrittlement can be alleviated by formation of protective oxide films on alloy surfaces, control of grain shape or addition of beneficial elements such as chromium. In contrast, ordered inter-metallics based on b.c.c. crystal structures such as FeAl(B2) and Fe3Al(D03) do not show environmental embrittlement at elevated temperatures. The embrittling behavior as well as alloy design to alleviate the embrittlement is discussed in this papaer. (A)

AB - Ordered intermetallic alloys with L12 crystal structure such as Ni3Al and Ni3Si exhibit environmental embrittlement with much lower ductilities in air than in vacuum when being tested at elevated temperatures. The environmental embrittlement is sensitive to test temperature, alloy composition and grain geometry. The embrittling behavior at elevated temperatures is a dynamic phenomenon, i.e. gaseous oxygen in test environments is chemically absorbed at the tip of cracks induced on alloy surfaces by deformation and then drives into the metal along grain boundaries, leading to a reduction of the grain boundary cohesion. The embrittlement can be alleviated by formation of protective oxide films on alloy surfaces, control of grain shape or addition of beneficial elements such as chromium. In contrast, ordered inter-metallics based on b.c.c. crystal structures such as FeAl(B2) and Fe3Al(D03) do not show environmental embrittlement at elevated temperatures. The embrittling behavior as well as alloy design to alleviate the embrittlement is discussed in this papaer. (A)

UR - http://www.scopus.com/inward/record.url?scp=85041152932&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85041152932&origin=recordpage

U2 - 10.1016/b978-1-85166-822-9.50086-8

DO - 10.1016/b978-1-85166-822-9.50086-8

M3 - RGC 32 - Refereed conference paper (with host publication)

SN - 9781851668229

T3 - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

SP - 538

EP - 547

BT - High Temperature Aluminides and Intermetallics

A2 - WHANG, S.H.

A2 - POPE, D.P.

A2 - LIU, C.T.

PB - Elsevier

T2 - 2nd International ASM Conference on High Temperature Aluminides and Intermetallics

Y2 - 16 September 1991 through 19 September 1991

ER -

Takeyama M, Liu CT. Elevated-temperature environmental embrittlement and alloy design of L1₂ ordered intermetallics. In WHANG SH, POPE DP, LIU CT, editors, High Temperature Aluminides and Intermetallics: Proceedings of the Second International ASM Conference on High Temperature Aluminides and Intermetallics, September 16–19, 1991, San Diego, CA, USA. Elsevier. 1992. p. 538-547. (Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing). doi: 10.1016/b978-1-85166-822-9.50086-8

Elevated-temperature environmental embrittlement and alloy design of L1₂ ordered intermetallics

Abstract

Publication series

Conference

Bibliographical note

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Elevated-temperature environmental embrittlement and alloy design of L1₂ ordered intermetallics

Cite this