Effects of Yb and Zr microalloying additions on the microstructure and mechanical properties of dilute Al-Sc alloys

Marsha E. Van Dalen; Thomas Gyger; David C. Dunand; David N. Seidman

doi:10.1016/j.actamat.2011.09.019

Effects of Yb and Zr microalloying additions on the microstructure and mechanical properties of dilute Al-Sc alloys

Marsha E. Van Dalen^*, Thomas Gyger, David C. Dunand, David N. Seidman

^*Corresponding author for this work

Materials Science and Engineering

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

99 Scopus citations

Abstract

It is known that Zr and Yb partition to the Al₃Sc precipitates created during aging when microalloyed separately in dilute binary Al-Sc alloys. Addition of Zr delays precipitate coarsening, thereby improving the coarsening resistance of the ternary Al-Sc-Zr alloys. Addition of Yb increases the resistance against dislocation climb, thereby improving the creep resistances of the ternary Al-Sc-Yb alloys. A combination of microhardness, creep, and atom probe tomography measurements provide evidence that these effects of Zr and Yb additions are cumulative in quaternary dilute Al-Sc-Yb-Zr alloys: Yb increases their creep resistance at 300 °C compared with ternary Al-Sc-Zr alloys and Zr improves their coarsening resistance at 300 °C compared with ternary Al-Sc-Yb alloys. Additionally, excellent coarsening resistance is observed at 350 and 375 °C.

Original language	English (US)
Pages (from-to)	7615-7626
Number of pages	12
Journal	Acta Materialia
Volume	59
Issue number	20
DOIs	https://doi.org/10.1016/j.actamat.2011.09.019
State	Published - Dec 2011

Keywords

Aluminum alloys
Coarsening
Creep
Nucleation
Precipitation

ASJC Scopus subject areas

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

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10.1016/j.actamat.2011.09.019

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title = "Effects of Yb and Zr microalloying additions on the microstructure and mechanical properties of dilute Al-Sc alloys",

abstract = "It is known that Zr and Yb partition to the Al3Sc precipitates created during aging when microalloyed separately in dilute binary Al-Sc alloys. Addition of Zr delays precipitate coarsening, thereby improving the coarsening resistance of the ternary Al-Sc-Zr alloys. Addition of Yb increases the resistance against dislocation climb, thereby improving the creep resistances of the ternary Al-Sc-Yb alloys. A combination of microhardness, creep, and atom probe tomography measurements provide evidence that these effects of Zr and Yb additions are cumulative in quaternary dilute Al-Sc-Yb-Zr alloys: Yb increases their creep resistance at 300 °C compared with ternary Al-Sc-Zr alloys and Zr improves their coarsening resistance at 300 °C compared with ternary Al-Sc-Yb alloys. Additionally, excellent coarsening resistance is observed at 350 and 375 °C.",

keywords = "Aluminum alloys, Coarsening, Creep, Nucleation, Precipitation",

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

note = "Funding Information: This research was supported through Grant DE-FG02-98ER45721 from the US Department of Energy (Basic Energy Sciences, monitor Dr. John Vetrano). Atom probe tomographic measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT) using a LEAP tomograph purchased with funding from the NSF-MRI (DMR-0420532, monitor Dr. Charles Bouldin) and ONR-DURIP (N00014-0400798, monitor Dr. Julie Christodoulou) programs.",

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doi = "10.1016/j.actamat.2011.09.019",

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volume = "59",

pages = "7615--7626",

journal = "Acta Materialia",

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AU - Van Dalen, Marsha E.

AU - Gyger, Thomas

AU - Dunand, David C.

AU - Seidman, David N.

N1 - Funding Information: This research was supported through Grant DE-FG02-98ER45721 from the US Department of Energy (Basic Energy Sciences, monitor Dr. John Vetrano). Atom probe tomographic measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT) using a LEAP tomograph purchased with funding from the NSF-MRI (DMR-0420532, monitor Dr. Charles Bouldin) and ONR-DURIP (N00014-0400798, monitor Dr. Julie Christodoulou) programs.

PY - 2011/12

Y1 - 2011/12

N2 - It is known that Zr and Yb partition to the Al3Sc precipitates created during aging when microalloyed separately in dilute binary Al-Sc alloys. Addition of Zr delays precipitate coarsening, thereby improving the coarsening resistance of the ternary Al-Sc-Zr alloys. Addition of Yb increases the resistance against dislocation climb, thereby improving the creep resistances of the ternary Al-Sc-Yb alloys. A combination of microhardness, creep, and atom probe tomography measurements provide evidence that these effects of Zr and Yb additions are cumulative in quaternary dilute Al-Sc-Yb-Zr alloys: Yb increases their creep resistance at 300 °C compared with ternary Al-Sc-Zr alloys and Zr improves their coarsening resistance at 300 °C compared with ternary Al-Sc-Yb alloys. Additionally, excellent coarsening resistance is observed at 350 and 375 °C.

AB - It is known that Zr and Yb partition to the Al3Sc precipitates created during aging when microalloyed separately in dilute binary Al-Sc alloys. Addition of Zr delays precipitate coarsening, thereby improving the coarsening resistance of the ternary Al-Sc-Zr alloys. Addition of Yb increases the resistance against dislocation climb, thereby improving the creep resistances of the ternary Al-Sc-Yb alloys. A combination of microhardness, creep, and atom probe tomography measurements provide evidence that these effects of Zr and Yb additions are cumulative in quaternary dilute Al-Sc-Yb-Zr alloys: Yb increases their creep resistance at 300 °C compared with ternary Al-Sc-Zr alloys and Zr improves their coarsening resistance at 300 °C compared with ternary Al-Sc-Yb alloys. Additionally, excellent coarsening resistance is observed at 350 and 375 °C.

KW - Aluminum alloys

KW - Coarsening

KW - Creep

KW - Nucleation

KW - Precipitation

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Effects of Yb and Zr microalloying additions on the microstructure and mechanical properties of dilute Al-Sc alloys

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Keywords

ASJC Scopus subject areas

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