Precipitation evolution in Al-Zr and Al-Zr-Ti alloys during isothermal aging at 375-425 °C

Keith E. Knipling; David C. Dunand; David N. Seidman

doi:10.1016/j.actamat.2007.09.004

Precipitation evolution in Al-Zr and Al-Zr-Ti alloys during isothermal aging at 375-425 °C

Keith E. Knipling^*, David C. Dunand, David N. Seidman

^*Corresponding author for this work

Materials Science and Engineering

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

240 Scopus citations

Abstract

Formation of Al₃Zr or Al₃(Zr_1-x Ti_x) precipitates with a metastable L1₂ structure was investigated in conventionally solidified A1-0.1 Zr, Al-0.2 Zr, Al-0.1 Zr-0.1 Ti, and Al-0.2 Zr-0.2 Ti (at.%) alloys aged isothermally at 375, 400, or 425 °C. Pronounced hardening results from nanometer-scale, spheroidal Al₃Zr or Al₃(Zr_1-xTi_x) (L1₂) precipitates within solute-enriched dendrites. Interdendritic regions contain a significantly lower number density of coarser cauliflower-, rod- and plate-shaped precipitates with the L1₂ structure. Neither the magnitude of the peak-aged hardness, nor the subsequent loss in hardness due to overaging, is affected by ternary additions of Ti. After extended aging times (1600 h) at 425 °C, there is no difference in the mean precipitate radii of spheroidal Al₃Zr or Al₃(Zr_1-xTi_x) precipitates, confirming that Ti additions do not improve the coarsening resistance. Comparison with prior coarsening studies on Al₃Zr, and Al₃(Zr_1-xV_x), Al₃(Zr_1-xTi_x) and Al₃(Zr_1-x-yV_xTi_y) (L1₂) precipitates at 425 °C confirms the lack of an effect from ternary alloying additions.

Original language	English (US)
Pages (from-to)	114-127
Number of pages	14
Journal	Acta Materialia
Volume	56
Issue number	1
DOIs	https://doi.org/10.1016/j.actamat.2007.09.004
State	Published - Jan 2008

Keywords

Aluminum alloys
Coarsening
Precipitation strengthening
Titanium
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.2007.09.004

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@article{164db2af4c404da3b4b71e6409f73ab5,

title = "Precipitation evolution in Al-Zr and Al-Zr-Ti alloys during isothermal aging at 375-425 °C",

abstract = "Formation of Al3Zr or Al3(Zr1-x Tix) precipitates with a metastable L12 structure was investigated in conventionally solidified A1-0.1 Zr, Al-0.2 Zr, Al-0.1 Zr-0.1 Ti, and Al-0.2 Zr-0.2 Ti (at.%) alloys aged isothermally at 375, 400, or 425 °C. Pronounced hardening results from nanometer-scale, spheroidal Al3Zr or Al3(Zr1-xTix) (L12) precipitates within solute-enriched dendrites. Interdendritic regions contain a significantly lower number density of coarser cauliflower-, rod- and plate-shaped precipitates with the L12 structure. Neither the magnitude of the peak-aged hardness, nor the subsequent loss in hardness due to overaging, is affected by ternary additions of Ti. After extended aging times (1600 h) at 425 °C, there is no difference in the mean precipitate radii of spheroidal Al3Zr or Al3(Zr1-xTix) precipitates, confirming that Ti additions do not improve the coarsening resistance. Comparison with prior coarsening studies on Al3Zr, and Al3(Zr1-xVx), Al3(Zr1-xTix) and Al3(Zr1-x-yV xTiy) (L12) precipitates at 425 °C confirms the lack of an effect from ternary alloying additions.",

keywords = "Aluminum alloys, Coarsening, Precipitation strengthening, Titanium, Zirconium",

author = "Knipling, {Keith E.} and Dunand, {David C.} and Seidman, {David N.}",

note = "Funding Information: This research was supported by the US Department of Energy, Basic Sciences Division, under contract DE-FG02-02ER45997. The EDS composition profile ( Fig. 4 ) was obtained in the Center for Microanalysis of Materials, University of Illinois at Urbana-Champaign (UIUC), which is partially supported by the US Department of Energy under grant DE-FG02-91ER45439. We thank Dr J. Mabon (UIUC) for his assistance. We also thank Ms C.P. Lee and Mr J.D. Marvin (Northwestern University undergraduate students) for assistance with the microhardness measurements. We are pleased to acknowledge Professors M. Asta and D. Isheim (Northwestern University) for useful discussions.",

year = "2008",

month = jan,

doi = "10.1016/j.actamat.2007.09.004",

language = "English (US)",

volume = "56",

pages = "114--127",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier Limited",

number = "1",

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TY - JOUR

T1 - Precipitation evolution in Al-Zr and Al-Zr-Ti alloys during isothermal aging at 375-425 °C

AU - Knipling, Keith E.

AU - Dunand, David C.

AU - Seidman, David N.

N1 - Funding Information: This research was supported by the US Department of Energy, Basic Sciences Division, under contract DE-FG02-02ER45997. The EDS composition profile ( Fig. 4 ) was obtained in the Center for Microanalysis of Materials, University of Illinois at Urbana-Champaign (UIUC), which is partially supported by the US Department of Energy under grant DE-FG02-91ER45439. We thank Dr J. Mabon (UIUC) for his assistance. We also thank Ms C.P. Lee and Mr J.D. Marvin (Northwestern University undergraduate students) for assistance with the microhardness measurements. We are pleased to acknowledge Professors M. Asta and D. Isheim (Northwestern University) for useful discussions.

PY - 2008/1

Y1 - 2008/1

N2 - Formation of Al3Zr or Al3(Zr1-x Tix) precipitates with a metastable L12 structure was investigated in conventionally solidified A1-0.1 Zr, Al-0.2 Zr, Al-0.1 Zr-0.1 Ti, and Al-0.2 Zr-0.2 Ti (at.%) alloys aged isothermally at 375, 400, or 425 °C. Pronounced hardening results from nanometer-scale, spheroidal Al3Zr or Al3(Zr1-xTix) (L12) precipitates within solute-enriched dendrites. Interdendritic regions contain a significantly lower number density of coarser cauliflower-, rod- and plate-shaped precipitates with the L12 structure. Neither the magnitude of the peak-aged hardness, nor the subsequent loss in hardness due to overaging, is affected by ternary additions of Ti. After extended aging times (1600 h) at 425 °C, there is no difference in the mean precipitate radii of spheroidal Al3Zr or Al3(Zr1-xTix) precipitates, confirming that Ti additions do not improve the coarsening resistance. Comparison with prior coarsening studies on Al3Zr, and Al3(Zr1-xVx), Al3(Zr1-xTix) and Al3(Zr1-x-yV xTiy) (L12) precipitates at 425 °C confirms the lack of an effect from ternary alloying additions.

AB - Formation of Al3Zr or Al3(Zr1-x Tix) precipitates with a metastable L12 structure was investigated in conventionally solidified A1-0.1 Zr, Al-0.2 Zr, Al-0.1 Zr-0.1 Ti, and Al-0.2 Zr-0.2 Ti (at.%) alloys aged isothermally at 375, 400, or 425 °C. Pronounced hardening results from nanometer-scale, spheroidal Al3Zr or Al3(Zr1-xTix) (L12) precipitates within solute-enriched dendrites. Interdendritic regions contain a significantly lower number density of coarser cauliflower-, rod- and plate-shaped precipitates with the L12 structure. Neither the magnitude of the peak-aged hardness, nor the subsequent loss in hardness due to overaging, is affected by ternary additions of Ti. After extended aging times (1600 h) at 425 °C, there is no difference in the mean precipitate radii of spheroidal Al3Zr or Al3(Zr1-xTix) precipitates, confirming that Ti additions do not improve the coarsening resistance. Comparison with prior coarsening studies on Al3Zr, and Al3(Zr1-xVx), Al3(Zr1-xTix) and Al3(Zr1-x-yV xTiy) (L12) precipitates at 425 °C confirms the lack of an effect from ternary alloying additions.

KW - Aluminum alloys

KW - Coarsening

KW - Precipitation strengthening

KW - Titanium

KW - Zirconium

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U2 - 10.1016/j.actamat.2007.09.004

DO - 10.1016/j.actamat.2007.09.004

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AN - SCOPUS:36248987820

SN - 1359-6454

VL - 56

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EP - 127

JO - Acta Materialia

JF - Acta Materialia

IS - 1

ER -

Precipitation evolution in Al-Zr and Al-Zr-Ti alloys during isothermal aging at 375-425 °C

Abstract

Keywords

ASJC Scopus subject areas

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