Creep of Al-Sc microalloys with rare-earth element additions

Richard A. Karnesky; David N. Seidman; David C. Dunand

doi:10.4028/www.scientific.net/msf.519-521.1035

Creep of Al-Sc microalloys with rare-earth element additions

Richard A. Karnesky^*, David N. Seidman, David C. Dunand

^*Corresponding author for this work

Materials Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

56 Scopus citations

Abstract

Cast and aged Al-Sc microalloys are creep-resistant to 300°C, due to the blocking of dislocations by nanosize, coherent Al₃Sc (Ll ₂) precipitates. Rare-earth elements substitute for Sc in these precipitates, leading to a higher number density of smaller precipitates, which have a greater lattice-parameter mismatch with Al than in the Al-Sc binary microalloy. This leads to an improvement in both ambient temperature microhardness and high temperature creep. Creep threshold stresses of Al-Sc-RE (RE = Y, Dy, or Er) at 300°C are higher than for Al-Sc and Al-Sc-M (M = Mg, Ti, or Zr) microalloys. This is in agreement with a dislocation climb model that includes the elastic stress fields of the precipitates.

Original language	English (US)
Title of host publication	Aluminium Alloys 2006
Subtitle of host publication	Research Through Innovation and Technology - Proceedings of the 10th International Conference on Aluminium Alloys
Publisher	Trans Tech Publications Ltd
Pages	1035-1040
Number of pages	6
Edition	PART 2
ISBN (Print)	9780878494088
DOIs	https://doi.org/10.4028/www.scientific.net/msf.519-521.1035
State	Published - 2006
Event	10th International Conference on Aluminium Alloys, (ICAA-10) - Vancouver, Canada Duration: Jul 9 2006 → Jul 13 2006

Publication series

Name	Materials Science Forum
Number	PART 2
Volume	519-521
ISSN (Print)	0255-5476
ISSN (Electronic)	1662-9752

Other

Other	10th International Conference on Aluminium Alloys, (ICAA-10)
Country/Territory	Canada
City	Vancouver
Period	7/9/06 → 7/13/06

Keywords

Creep
Precipitation strengthening
Rare-earth elements
Scandium

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.4028/www.scientific.net/msf.519-521.1035

Cite this

Karnesky, R. A., Seidman, D. N., & Dunand, D. C. (2006). Creep of Al-Sc microalloys with rare-earth element additions. In Aluminium Alloys 2006: Research Through Innovation and Technology - Proceedings of the 10th International Conference on Aluminium Alloys (PART 2 ed., pp. 1035-1040). (Materials Science Forum; Vol. 519-521, No. PART 2). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/msf.519-521.1035

@inproceedings{a9c8ab1b77214d2b98378fb02cee1a95,

title = "Creep of Al-Sc microalloys with rare-earth element additions",

abstract = "Cast and aged Al-Sc microalloys are creep-resistant to 300°C, due to the blocking of dislocations by nanosize, coherent Al3Sc (Ll 2) precipitates. Rare-earth elements substitute for Sc in these precipitates, leading to a higher number density of smaller precipitates, which have a greater lattice-parameter mismatch with Al than in the Al-Sc binary microalloy. This leads to an improvement in both ambient temperature microhardness and high temperature creep. Creep threshold stresses of Al-Sc-RE (RE = Y, Dy, or Er) at 300°C are higher than for Al-Sc and Al-Sc-M (M = Mg, Ti, or Zr) microalloys. This is in agreement with a dislocation climb model that includes the elastic stress fields of the precipitates.",

keywords = "Creep, Precipitation strengthening, Rare-earth elements, Scandium",

author = "Karnesky, {Richard A.} and Seidman, {David N.} and Dunand, {David C.}",

year = "2006",

doi = "10.4028/www.scientific.net/msf.519-521.1035",

language = "English (US)",

isbn = "9780878494088",

series = "Materials Science Forum",

publisher = "Trans Tech Publications Ltd",

number = "PART 2",

pages = "1035--1040",

booktitle = "Aluminium Alloys 2006",

edition = "PART 2",

}

Karnesky, RA, Seidman, DN & Dunand, DC 2006, Creep of Al-Sc microalloys with rare-earth element additions. in Aluminium Alloys 2006: Research Through Innovation and Technology - Proceedings of the 10th International Conference on Aluminium Alloys. PART 2 edn, Materials Science Forum, no. PART 2, vol. 519-521, Trans Tech Publications Ltd, pp. 1035-1040, 10th International Conference on Aluminium Alloys, (ICAA-10), Vancouver, Canada, 7/9/06. https://doi.org/10.4028/www.scientific.net/msf.519-521.1035

Creep of Al-Sc microalloys with rare-earth element additions. / Karnesky, Richard A.; Seidman, David N.; Dunand, David C.
Aluminium Alloys 2006: Research Through Innovation and Technology - Proceedings of the 10th International Conference on Aluminium Alloys. PART 2. ed. Trans Tech Publications Ltd, 2006. p. 1035-1040 (Materials Science Forum; Vol. 519-521, No. PART 2).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Creep of Al-Sc microalloys with rare-earth element additions

AU - Karnesky, Richard A.

AU - Seidman, David N.

AU - Dunand, David C.

PY - 2006

Y1 - 2006

N2 - Cast and aged Al-Sc microalloys are creep-resistant to 300°C, due to the blocking of dislocations by nanosize, coherent Al3Sc (Ll 2) precipitates. Rare-earth elements substitute for Sc in these precipitates, leading to a higher number density of smaller precipitates, which have a greater lattice-parameter mismatch with Al than in the Al-Sc binary microalloy. This leads to an improvement in both ambient temperature microhardness and high temperature creep. Creep threshold stresses of Al-Sc-RE (RE = Y, Dy, or Er) at 300°C are higher than for Al-Sc and Al-Sc-M (M = Mg, Ti, or Zr) microalloys. This is in agreement with a dislocation climb model that includes the elastic stress fields of the precipitates.

AB - Cast and aged Al-Sc microalloys are creep-resistant to 300°C, due to the blocking of dislocations by nanosize, coherent Al3Sc (Ll 2) precipitates. Rare-earth elements substitute for Sc in these precipitates, leading to a higher number density of smaller precipitates, which have a greater lattice-parameter mismatch with Al than in the Al-Sc binary microalloy. This leads to an improvement in both ambient temperature microhardness and high temperature creep. Creep threshold stresses of Al-Sc-RE (RE = Y, Dy, or Er) at 300°C are higher than for Al-Sc and Al-Sc-M (M = Mg, Ti, or Zr) microalloys. This is in agreement with a dislocation climb model that includes the elastic stress fields of the precipitates.

KW - Creep

KW - Precipitation strengthening

KW - Rare-earth elements

KW - Scandium

UR - http://www.scopus.com/inward/record.url?scp=33846584519&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846584519&partnerID=8YFLogxK

U2 - 10.4028/www.scientific.net/msf.519-521.1035

DO - 10.4028/www.scientific.net/msf.519-521.1035

M3 - Conference contribution

AN - SCOPUS:33846584519

SN - 9780878494088

T3 - Materials Science Forum

SP - 1035

EP - 1040

BT - Aluminium Alloys 2006

PB - Trans Tech Publications Ltd

T2 - 10th International Conference on Aluminium Alloys, (ICAA-10)

Y2 - 9 July 2006 through 13 July 2006

ER -

Karnesky RA, Seidman DN , Dunand DC. Creep of Al-Sc microalloys with rare-earth element additions. In Aluminium Alloys 2006: Research Through Innovation and Technology - Proceedings of the 10th International Conference on Aluminium Alloys. PART 2 ed. Trans Tech Publications Ltd. 2006. p. 1035-1040. (Materials Science Forum; PART 2). doi: 10.4028/www.scientific.net/msf.519-521.1035

Creep of Al-Sc microalloys with rare-earth element additions

Abstract

Publication series

Other

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this