Precipitation evolution in Al-0.1Sc, Al-0.1Zr and Al-0.1Sc-0.1Zr (at.%) alloys during isochronal aging

Keith E. Knipling; Richard A. Karnesky; Constance P. Lee; David C. Dunand; David N. Seidman

doi:10.1016/j.actamat.2010.05.054

Precipitation evolution in Al-0.1Sc, Al-0.1Zr and Al-0.1Sc-0.1Zr (at.%) alloys during isochronal aging

Keith E. Knipling, Richard A. Karnesky, Constance P. Lee, David C. Dunand, David N. Seidman

Materials Science and Engineering

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

399 Scopus citations

Abstract

Precipitation strengthening is investigated in binary Al-0.1Sc, Al-0.1Zr and ternary Al-0.1Sc-0.1Zr (at.%) alloys aged isochronally between 200 and 600 °C. Precipitation of Al₃Sc (L1₂) commences between 200 and 250 °C in Al-0.1Sc, reaching a 670 MPa peak microhardness at 325 °C. For Al-0.1Zr, precipitation of Al₃Zr (L1₂) initiates between 350 and 375 °C, resulting in a 420 MPa peak microhardness at 425-450 °C. A pronounced synergistic effect is observed when both Sc and Zr are present. Above 325 °C, Zr additions provide a secondary strength increase from the precipitation of Zr-enriched outer shells onto the Al ₃Sc precipitates, leading to a peak microhardness of 780 MPa at 400 °C for Al-0.1Sc-0.1Zr. Compositions, radii, volume fractions and number densities of the Al₃(Sc_1-xZr_x) precipitates are measured directly using atom-probe tomography. This information is used to quantify the observed strengthening increments, attributed to dislocation shearing of the Al₃(Sc_1-xZr_x) precipitates.

Original language	English (US)
Pages (from-to)	5184-5195
Number of pages	12
Journal	Acta Materialia
Volume	58
Issue number	15
DOIs	https://doi.org/10.1016/j.actamat.2010.05.054
State	Published - Sep 2010

Keywords

Aluminum alloys
Atom-probe tomography
Precipitation
Scandium
Zirconium

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.2010.05.054

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@article{df3494ab710340ebb2233a0f25d31963,

title = "Precipitation evolution in Al-0.1Sc, Al-0.1Zr and Al-0.1Sc-0.1Zr (at.%) alloys during isochronal aging",

abstract = "Precipitation strengthening is investigated in binary Al-0.1Sc, Al-0.1Zr and ternary Al-0.1Sc-0.1Zr (at.%) alloys aged isochronally between 200 and 600 °C. Precipitation of Al3Sc (L12) commences between 200 and 250 °C in Al-0.1Sc, reaching a 670 MPa peak microhardness at 325 °C. For Al-0.1Zr, precipitation of Al3Zr (L12) initiates between 350 and 375 °C, resulting in a 420 MPa peak microhardness at 425-450 °C. A pronounced synergistic effect is observed when both Sc and Zr are present. Above 325 °C, Zr additions provide a secondary strength increase from the precipitation of Zr-enriched outer shells onto the Al 3Sc precipitates, leading to a peak microhardness of 780 MPa at 400 °C for Al-0.1Sc-0.1Zr. Compositions, radii, volume fractions and number densities of the Al3(Sc1-xZrx) precipitates are measured directly using atom-probe tomography. This information is used to quantify the observed strengthening increments, attributed to dislocation shearing of the Al3(Sc1-xZrx) precipitates.",

keywords = "Aluminum alloys, Atom-probe tomography, Precipitation, Scandium, Zirconium",

author = "Knipling, {Keith E.} and Karnesky, {Richard A.} and Lee, {Constance P.} and Dunand, {David C.} and Seidman, {David N.}",

note = "Funding Information: This research is supported by the US Department of Energy, Basic Sciences Division, under contracts DE-FG02-02ER45997 and DE-FG02-98ER45721. APT 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, Dr. Charles Bouldin, monitor) and ONR-DURIP (N00014-0400798, Dr. Julie Christodoulou, monitor) programs. We are pleased to acknowledge Profs. Morris Fine and Dieter Isheim (Northwestern University) for useful discussions.",

year = "2010",

month = sep,

doi = "10.1016/j.actamat.2010.05.054",

language = "English (US)",

volume = "58",

pages = "5184--5195",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier Limited",

number = "15",

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TY - JOUR

T1 - Precipitation evolution in Al-0.1Sc, Al-0.1Zr and Al-0.1Sc-0.1Zr (at.%) alloys during isochronal aging

AU - Knipling, Keith E.

AU - Karnesky, Richard A.

AU - Lee, Constance P.

AU - Dunand, David C.

AU - Seidman, David N.

N1 - Funding Information: This research is supported by the US Department of Energy, Basic Sciences Division, under contracts DE-FG02-02ER45997 and DE-FG02-98ER45721. APT 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, Dr. Charles Bouldin, monitor) and ONR-DURIP (N00014-0400798, Dr. Julie Christodoulou, monitor) programs. We are pleased to acknowledge Profs. Morris Fine and Dieter Isheim (Northwestern University) for useful discussions.

PY - 2010/9

Y1 - 2010/9

N2 - Precipitation strengthening is investigated in binary Al-0.1Sc, Al-0.1Zr and ternary Al-0.1Sc-0.1Zr (at.%) alloys aged isochronally between 200 and 600 °C. Precipitation of Al3Sc (L12) commences between 200 and 250 °C in Al-0.1Sc, reaching a 670 MPa peak microhardness at 325 °C. For Al-0.1Zr, precipitation of Al3Zr (L12) initiates between 350 and 375 °C, resulting in a 420 MPa peak microhardness at 425-450 °C. A pronounced synergistic effect is observed when both Sc and Zr are present. Above 325 °C, Zr additions provide a secondary strength increase from the precipitation of Zr-enriched outer shells onto the Al 3Sc precipitates, leading to a peak microhardness of 780 MPa at 400 °C for Al-0.1Sc-0.1Zr. Compositions, radii, volume fractions and number densities of the Al3(Sc1-xZrx) precipitates are measured directly using atom-probe tomography. This information is used to quantify the observed strengthening increments, attributed to dislocation shearing of the Al3(Sc1-xZrx) precipitates.

AB - Precipitation strengthening is investigated in binary Al-0.1Sc, Al-0.1Zr and ternary Al-0.1Sc-0.1Zr (at.%) alloys aged isochronally between 200 and 600 °C. Precipitation of Al3Sc (L12) commences between 200 and 250 °C in Al-0.1Sc, reaching a 670 MPa peak microhardness at 325 °C. For Al-0.1Zr, precipitation of Al3Zr (L12) initiates between 350 and 375 °C, resulting in a 420 MPa peak microhardness at 425-450 °C. A pronounced synergistic effect is observed when both Sc and Zr are present. Above 325 °C, Zr additions provide a secondary strength increase from the precipitation of Zr-enriched outer shells onto the Al 3Sc precipitates, leading to a peak microhardness of 780 MPa at 400 °C for Al-0.1Sc-0.1Zr. Compositions, radii, volume fractions and number densities of the Al3(Sc1-xZrx) precipitates are measured directly using atom-probe tomography. This information is used to quantify the observed strengthening increments, attributed to dislocation shearing of the Al3(Sc1-xZrx) precipitates.

KW - Aluminum alloys

KW - Atom-probe tomography

KW - Precipitation

KW - Scandium

KW - Zirconium

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U2 - 10.1016/j.actamat.2010.05.054

DO - 10.1016/j.actamat.2010.05.054

M3 - Article

AN - SCOPUS:77955466052

SN - 1359-6454

VL - 58

SP - 5184

EP - 5195

JO - Acta Materialia

JF - Acta Materialia

IS - 15

ER -

Precipitation evolution in Al-0.1Sc, Al-0.1Zr and Al-0.1Sc-0.1Zr (at.%) alloys during isochronal aging

Abstract

Keywords

ASJC Scopus subject areas

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