Mechanical properties of Al(Sc,Zr) alloys at ambient and elevated temperatures

Christian B. Fuller; David N. Seidman; David C. Dunand

doi:10.1016/S1359-6454(03)00320-3

Mechanical properties of Al(Sc,Zr) alloys at ambient and elevated temperatures

Christian B. Fuller, David N. Seidman, David C. Dunand^*

^*Corresponding author for this work

Materials Science and Engineering

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

407 Scopus citations

Abstract

This study investigates the mechanical properties of ternary Al(Sc,Zr) alloys containing 0.27-0.77 vol.% of Al₃(Sc,Zr) precipitates with an average radius 〈r〉=2-24 nm. Microhardness values at ambient temperature follow predictions of the Orowan dislocation bypass mechanism, with a transition to the precipitate shearing mechanism predicted for 〈r〉 larger than 2 nm. Addition of Zr to binary Al(Sc) alloys delays the onset and kinetics of over-aging at 350 and 375 °C, but has little influence on the magnitude of the peak microhardness. Creep deformation at 300 °C is characterized by a threshold stress, which increases with 〈r〉 in the range 2-9 nm, in agreement with prior results for binary Al(Sc) alloys and a recently developed general climb model considering elastic interactions between dislocations and coherent, misfitting precipitates. At constant 〈r〉 and precipitate volume fraction, Zr additions do not significantly improve the creep resistance of Al(Sc) alloys.

Original language	English (US)
Pages (from-to)	4803-4814
Number of pages	12
Journal	Acta Materialia
Volume	51
Issue number	16
DOIs	https://doi.org/10.1016/S1359-6454(03)00320-3
State	Published - Sep 15 2003

Funding

This research was supported by the United States Department of Energy, Basic Energy Sciences Division, under contract DE-FG02-98ER45721. The authors thank Dr. E.A. Marquis (Northwestern University) for calculating curves in Fig. 8 , as well as Dr. R.W. Hyland, Jr. and Dr. J.L. Murray (Alcoa Inc.) for useful discussions. We would also like to thank Alcoa Inc. and Ashurst Inc. for supplying the Al–Sc master alloys and Alcoa Inc. for supplying the Al–Zr master alloy.

Keywords

Al-Sc-Zr alloys
Creep
Deformation mechanisms
Mechanical properties

ASJC Scopus subject areas

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

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10.1016/S1359-6454(03)00320-3

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title = "Mechanical properties of Al(Sc,Zr) alloys at ambient and elevated temperatures",

abstract = "This study investigates the mechanical properties of ternary Al(Sc,Zr) alloys containing 0.27-0.77 vol.% of Al3(Sc,Zr) precipitates with an average radius 〈r〉=2-24 nm. Microhardness values at ambient temperature follow predictions of the Orowan dislocation bypass mechanism, with a transition to the precipitate shearing mechanism predicted for 〈r〉 larger than 2 nm. Addition of Zr to binary Al(Sc) alloys delays the onset and kinetics of over-aging at 350 and 375 °C, but has little influence on the magnitude of the peak microhardness. Creep deformation at 300 °C is characterized by a threshold stress, which increases with 〈r〉 in the range 2-9 nm, in agreement with prior results for binary Al(Sc) alloys and a recently developed general climb model considering elastic interactions between dislocations and coherent, misfitting precipitates. At constant 〈r〉 and precipitate volume fraction, Zr additions do not significantly improve the creep resistance of Al(Sc) alloys.",

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author = "Fuller, {Christian B.} and Seidman, {David N.} and Dunand, {David C.}",

note = "Funding Information: This research was supported by the United States Department of Energy, Basic Energy Sciences Division, under contract DE-FG02-98ER45721. The authors thank Dr. E.A. Marquis (Northwestern University) for calculating curves in Fig. 8 , as well as Dr. R.W. Hyland, Jr. and Dr. J.L. Murray (Alcoa Inc.) for useful discussions. We would also like to thank Alcoa Inc. and Ashurst Inc. for supplying the Al–Sc master alloys and Alcoa Inc. for supplying the Al–Zr master alloy. ",

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N2 - This study investigates the mechanical properties of ternary Al(Sc,Zr) alloys containing 0.27-0.77 vol.% of Al3(Sc,Zr) precipitates with an average radius 〈r〉=2-24 nm. Microhardness values at ambient temperature follow predictions of the Orowan dislocation bypass mechanism, with a transition to the precipitate shearing mechanism predicted for 〈r〉 larger than 2 nm. Addition of Zr to binary Al(Sc) alloys delays the onset and kinetics of over-aging at 350 and 375 °C, but has little influence on the magnitude of the peak microhardness. Creep deformation at 300 °C is characterized by a threshold stress, which increases with 〈r〉 in the range 2-9 nm, in agreement with prior results for binary Al(Sc) alloys and a recently developed general climb model considering elastic interactions between dislocations and coherent, misfitting precipitates. At constant 〈r〉 and precipitate volume fraction, Zr additions do not significantly improve the creep resistance of Al(Sc) alloys.

AB - This study investigates the mechanical properties of ternary Al(Sc,Zr) alloys containing 0.27-0.77 vol.% of Al3(Sc,Zr) precipitates with an average radius 〈r〉=2-24 nm. Microhardness values at ambient temperature follow predictions of the Orowan dislocation bypass mechanism, with a transition to the precipitate shearing mechanism predicted for 〈r〉 larger than 2 nm. Addition of Zr to binary Al(Sc) alloys delays the onset and kinetics of over-aging at 350 and 375 °C, but has little influence on the magnitude of the peak microhardness. Creep deformation at 300 °C is characterized by a threshold stress, which increases with 〈r〉 in the range 2-9 nm, in agreement with prior results for binary Al(Sc) alloys and a recently developed general climb model considering elastic interactions between dislocations and coherent, misfitting precipitates. At constant 〈r〉 and precipitate volume fraction, Zr additions do not significantly improve the creep resistance of Al(Sc) alloys.

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KW - Deformation mechanisms

KW - Mechanical properties

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Mechanical properties of Al(Sc,Zr) alloys at ambient and elevated temperatures

Abstract

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