Effect of Yb microadditions on creep resistance of a dilute Al-Er-Sc-Zr alloy

Nhon Q. Vo; Davaadorj Bayansan; Amirreza Sanaty-Zadeh; Evander H. Ramos; David C. Dunand

doi:10.1016/j.mtla.2018.08.030

Effect of Yb microadditions on creep resistance of a dilute Al-Er-Sc-Zr alloy

Nhon Q. Vo^*, Davaadorj Bayansan, Amirreza Sanaty-Zadeh, Evander H. Ramos, David C. Dunand

^*Corresponding author for this work

Materials Science and Engineering

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

30 Scopus citations

Abstract

A dilute Al-0.02Yb-0.01Er-0.03Sc-0.03Zr (at.%) alloy was aged to create a high number density of Al₃(Sc_0.56Yb_0.14Er_0.10Zr_0.20) nanoprecipitates, with 3.5 nm radius, an Yb- and Er-enriched core and Sc- and Zr-enriched shells, as measured via atom-probe tomography. At 400 °C, the alloy exhibits a 17 MPa threshold stress, 2–3 times higher than previously-studied, Sc-richer Al-0.06Sc-0.06Zr and Al-0.01Er-0.05Sc-0.06Zr (at.%) alloys with Al₃(Sc,Zr) and Al₃(Sc,Zr,Er) nanoprecipitates. This improvement is consistent with Yb/Er enrichment within the nanoprecipitates, increasing their lattice mismatch with the matrix.

Original language	English (US)
Pages (from-to)	65-69
Number of pages	5
Journal	Materialia
Volume	4
DOIs	https://doi.org/10.1016/j.mtla.2018.08.030
State	Published - Dec 2018

Funding

This research was sponsored by Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-10-2-0098 (Mr. V.K. Champagne, monitor). The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, or the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. Useful discussions with Prof. D. Luzzi ( Northeastern University ) are acknowledged. The authors thank Mr. E. Klier ( Army Research Laboratory ) for numerous insightful discussions on the topic of rare-earth elements. Atom-probe tomography was performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The LEAP tomograph at NUCAPT was purchased and upgraded with grants from the NSF-MRI (DMR-0420532) and ONR-DURIP (N00014-0400798, N00014-0610539, N00014-0910781, N00014-1712870) programs. NUCAPT received support from the MRSEC program (NSF DMR-1720139) at the Materials Research Center, the SHyNE Resource (NSF ECCS-1542205), and the Initiative for Sustainability and Energy (ISEN) at Northwestern University.

Keywords

Al-Yb-Er-Sc-Zr alloy
Atom-probe tomography
Creep
High-temperature alloy
Strengthening

ASJC Scopus subject areas

General Materials Science

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10.1016/j.mtla.2018.08.030

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title = "Effect of Yb microadditions on creep resistance of a dilute Al-Er-Sc-Zr alloy",

abstract = "A dilute Al-0.02Yb-0.01Er-0.03Sc-0.03Zr (at.%) alloy was aged to create a high number density of Al3(Sc0.56Yb0.14Er0.10Zr0.20) nanoprecipitates, with 3.5 nm radius, an Yb- and Er-enriched core and Sc- and Zr-enriched shells, as measured via atom-probe tomography. At 400 °C, the alloy exhibits a 17 MPa threshold stress, 2–3 times higher than previously-studied, Sc-richer Al-0.06Sc-0.06Zr and Al-0.01Er-0.05Sc-0.06Zr (at.%) alloys with Al3(Sc,Zr) and Al3(Sc,Zr,Er) nanoprecipitates. This improvement is consistent with Yb/Er enrichment within the nanoprecipitates, increasing their lattice mismatch with the matrix.",

keywords = "Al-Yb-Er-Sc-Zr alloy, Atom-probe tomography, Creep, High-temperature alloy, Strengthening",

author = "Vo, {Nhon Q.} and Davaadorj Bayansan and Amirreza Sanaty-Zadeh and Ramos, {Evander H.} and Dunand, {David C.}",

note = "Publisher Copyright: {\textcopyright} 2018 Acta Materialia Inc.",

year = "2018",

month = dec,

doi = "10.1016/j.mtla.2018.08.030",

language = "English (US)",

volume = "4",

pages = "65--69",

journal = "Materialia",

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T1 - Effect of Yb microadditions on creep resistance of a dilute Al-Er-Sc-Zr alloy

AU - Vo, Nhon Q.

AU - Bayansan, Davaadorj

AU - Sanaty-Zadeh, Amirreza

AU - Ramos, Evander H.

AU - Dunand, David C.

PY - 2018/12

Y1 - 2018/12

N2 - A dilute Al-0.02Yb-0.01Er-0.03Sc-0.03Zr (at.%) alloy was aged to create a high number density of Al3(Sc0.56Yb0.14Er0.10Zr0.20) nanoprecipitates, with 3.5 nm radius, an Yb- and Er-enriched core and Sc- and Zr-enriched shells, as measured via atom-probe tomography. At 400 °C, the alloy exhibits a 17 MPa threshold stress, 2–3 times higher than previously-studied, Sc-richer Al-0.06Sc-0.06Zr and Al-0.01Er-0.05Sc-0.06Zr (at.%) alloys with Al3(Sc,Zr) and Al3(Sc,Zr,Er) nanoprecipitates. This improvement is consistent with Yb/Er enrichment within the nanoprecipitates, increasing their lattice mismatch with the matrix.

AB - A dilute Al-0.02Yb-0.01Er-0.03Sc-0.03Zr (at.%) alloy was aged to create a high number density of Al3(Sc0.56Yb0.14Er0.10Zr0.20) nanoprecipitates, with 3.5 nm radius, an Yb- and Er-enriched core and Sc- and Zr-enriched shells, as measured via atom-probe tomography. At 400 °C, the alloy exhibits a 17 MPa threshold stress, 2–3 times higher than previously-studied, Sc-richer Al-0.06Sc-0.06Zr and Al-0.01Er-0.05Sc-0.06Zr (at.%) alloys with Al3(Sc,Zr) and Al3(Sc,Zr,Er) nanoprecipitates. This improvement is consistent with Yb/Er enrichment within the nanoprecipitates, increasing their lattice mismatch with the matrix.

KW - Al-Yb-Er-Sc-Zr alloy

KW - Atom-probe tomography

KW - Creep

KW - High-temperature alloy

KW - Strengthening

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JO - Materialia

JF - Materialia

ER -

Effect of Yb microadditions on creep resistance of a dilute Al-Er-Sc-Zr alloy

Abstract

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Keywords

ASJC Scopus subject areas

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