Creep- and coarsening properties of Al-0.06 at.% Sc-0.06 at.% Ti at 300-450 °C

Marsha E. van Dalen; David N. Seidman; David C. Dunand

doi:10.1016/j.actamat.2008.05.002

Creep- and coarsening properties of Al-0.06 at.% Sc-0.06 at.% Ti at 300-450 °C

Marsha E. van Dalen^*, David N. Seidman, David C. Dunand

^*Corresponding author for this work

Materials Science and Engineering

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

70 Scopus citations

Abstract

Upon aging at 300-450 °C, nanosize, coherent Al₃(Sc_1-xTi_x) precipitates are formed in pure aluminum micro-alloyed with 0.06 at.% Sc and 0.06 at.% Ti. The outstanding coarsening resistance of these precipitates at these elevated temperatures (61-77% of the melting temperature of aluminum) is explained by the significantly smaller diffusivity of Ti in Al when compared to that of Sc in Al. Furthermore, this coarse-grained alloy exhibits good compressive creep resistance for a castable, heat-treatable aluminum alloy: the creep threshold stress varies from 17 MPa at 300 °C to 7 MPa at 425 °C, as expected if the climb bypass by dislocations of the mismatching precipitates is hindered by their elastic stress fields.

Original language	English (US)
Pages (from-to)	4369-4377
Number of pages	9
Journal	Acta Materialia
Volume	56
Issue number	16
DOIs	https://doi.org/10.1016/j.actamat.2008.05.002
State	Published - Oct 2008

Keywords

Aluminum alloys
Creep
Nanostructure
Precipitation
Titanium

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

Access to Document

10.1016/j.actamat.2008.05.002

Cite this

@article{eba43b67757046f3a1fe187176085a64,

title = "Creep- and coarsening properties of Al-0.06 at.% Sc-0.06 at.% Ti at 300-450 °C",

abstract = "Upon aging at 300-450 °C, nanosize, coherent Al3(Sc1-xTix) precipitates are formed in pure aluminum micro-alloyed with 0.06 at.% Sc and 0.06 at.% Ti. The outstanding coarsening resistance of these precipitates at these elevated temperatures (61-77% of the melting temperature of aluminum) is explained by the significantly smaller diffusivity of Ti in Al when compared to that of Sc in Al. Furthermore, this coarse-grained alloy exhibits good compressive creep resistance for a castable, heat-treatable aluminum alloy: the creep threshold stress varies from 17 MPa at 300 °C to 7 MPa at 425 °C, as expected if the climb bypass by dislocations of the mismatching precipitates is hindered by their elastic stress fields.",

keywords = "Aluminum alloys, Creep, Nanostructure, Precipitation, Titanium",

author = "{van Dalen}, {Marsha E.} and Seidman, {David N.} and Dunand, {David C.}",

note = "Funding Information: This research is supported by the US Department of Energy through grant DE-FG02-98ER45721. Atom-probe tomographic measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The LEAP {\texttrademark} tomograph was purchased with funding from the NSF-MRI (DMR 0420532, Dr. Charles Bouldin, grant officer) and ONR-DURIP (N00014-0400798, Dr. Julie Christodoulou, grant officer) programs. Additionally, the LEAP tomograph was enhanced in April 2006 with a picosecond laser with funding from the ONR-DURIP (N00014-0610539, J. Christodoulou, grant officer). We thank Research Assistant Professor Dieter Isheim for managing NUCAPT. We also thank Keith Knipling and Richard Karnesky for interesting discussions. ",

year = "2008",

month = oct,

doi = "10.1016/j.actamat.2008.05.002",

language = "English (US)",

volume = "56",

pages = "4369--4377",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Acta Materialia Inc",

number = "16",

}

TY - JOUR

T1 - Creep- and coarsening properties of Al-0.06 at.% Sc-0.06 at.% Ti at 300-450 °C

AU - van Dalen, Marsha E.

AU - Seidman, David N.

AU - Dunand, David C.

N1 - Funding Information: This research is supported by the US Department of Energy through grant DE-FG02-98ER45721. Atom-probe tomographic measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The LEAP ™ tomograph was purchased with funding from the NSF-MRI (DMR 0420532, Dr. Charles Bouldin, grant officer) and ONR-DURIP (N00014-0400798, Dr. Julie Christodoulou, grant officer) programs. Additionally, the LEAP tomograph was enhanced in April 2006 with a picosecond laser with funding from the ONR-DURIP (N00014-0610539, J. Christodoulou, grant officer). We thank Research Assistant Professor Dieter Isheim for managing NUCAPT. We also thank Keith Knipling and Richard Karnesky for interesting discussions.

PY - 2008/10

Y1 - 2008/10

N2 - Upon aging at 300-450 °C, nanosize, coherent Al3(Sc1-xTix) precipitates are formed in pure aluminum micro-alloyed with 0.06 at.% Sc and 0.06 at.% Ti. The outstanding coarsening resistance of these precipitates at these elevated temperatures (61-77% of the melting temperature of aluminum) is explained by the significantly smaller diffusivity of Ti in Al when compared to that of Sc in Al. Furthermore, this coarse-grained alloy exhibits good compressive creep resistance for a castable, heat-treatable aluminum alloy: the creep threshold stress varies from 17 MPa at 300 °C to 7 MPa at 425 °C, as expected if the climb bypass by dislocations of the mismatching precipitates is hindered by their elastic stress fields.

AB - Upon aging at 300-450 °C, nanosize, coherent Al3(Sc1-xTix) precipitates are formed in pure aluminum micro-alloyed with 0.06 at.% Sc and 0.06 at.% Ti. The outstanding coarsening resistance of these precipitates at these elevated temperatures (61-77% of the melting temperature of aluminum) is explained by the significantly smaller diffusivity of Ti in Al when compared to that of Sc in Al. Furthermore, this coarse-grained alloy exhibits good compressive creep resistance for a castable, heat-treatable aluminum alloy: the creep threshold stress varies from 17 MPa at 300 °C to 7 MPa at 425 °C, as expected if the climb bypass by dislocations of the mismatching precipitates is hindered by their elastic stress fields.

KW - Aluminum alloys

KW - Creep

KW - Nanostructure

KW - Precipitation

KW - Titanium

UR - http://www.scopus.com/inward/record.url?scp=50249176461&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=50249176461&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2008.05.002

DO - 10.1016/j.actamat.2008.05.002

M3 - Article

AN - SCOPUS:50249176461

SN - 1359-6454

VL - 56

SP - 4369

EP - 4377

JO - Acta Materialia

JF - Acta Materialia

IS - 16

ER -

Creep- and coarsening properties of Al-0.06 at.% Sc-0.06 at.% Ti at 300-450 °C

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this