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Thermal Stability of the Structure and Mechanical Properties of Fine-Grained Aluminum Conductor Alloys Al–Mg–Zr–Sc(Yb)

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Abstract

The thermal stability of a fine-grained aluminum wire made of Al–Mg–Zr–Sc(Yb) alloys with different zirconium and scandium (ytterbium) contents is studied. Samples are produced by induction casting and subsequent cold working by drawing. The structure and properties of fine-grained the Al–0.6Mg–Zr–Sc alloys are shown to exhibit high thermal stability due to preliminary (before drawing) annealing at 320°C for 2 h, resulting in the precipitation of intermetallic Al3(ScxZr1 – x) particles. A fine-grained homogeneous structure with an average grain size of 2.4–2.8 μm and a microhardness of 405–440 MPa is found to be retained in the Al–0.6Mg–Zr–Sc alloys after prolonged annealing at 400°C for 100 h. A fine-grained magnesium-free Al–0.33Zr–0.16Yb ytterbium alloy has a low hardness and low thermal stability. The average grain size in it after annealing at 400°C for 100 h is 4.1–4.8 μm.

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Notes

  1. The results presented in [26–30] show a pronounced positive effect of ytterbium on the thermal stability of Al–Zr alloys owing to the formation of Al3(Zr,Yb) particles with a growth rate (coalescence), which is lower than that of Al3Zr and Al3Sc particles with an L12 structure. According to [27], this is due to their unique “core–shell” structure, in which a Al3Zr core is surrounded by a Al3Yb shell.

  2. This result indicates, in our opinion, that there is no definite correlation between the ultimate tensile strength and the microhardness in the investigated aluminum alloys. The correlation is often described by ratio σu = HV0.5∕k, where k is the numerical coefficient and k ≈ 3.

  3. The calculation was carried out assuming that Al3(ScxZr1 – x) particles precipitate during the annealing, and the solubility limit of scandium and zirconium in aluminum at 320°C is zero.

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ACKNOWLEDGMENTS

We thank V.V. Zakharov (AO VILS, Moscow) for his recommendations regarding the choice of casting and preliminary aging conditions for the aluminum alloys.

Funding

This work was supported by the Russian Scientific Foundation (project no. 18-13-00306).

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Authors and Affiliations

  1. Lobachevskii Nizhny Novgorod State University, 603600, Nizhny Novgorod, Russia

    V. N. Chuvil’deev, A. V. Nokhrin, Ya. S. Shadrina, A. V. Piskunov, V. I. Kopylov & N. N. Berendeev

  2. Physicotechnical Institute, Belarussian Academy of Sciences, 220141, Minsk, Belarus

    V. I. Kopylov

  3. Moscow Factory for Processing Special Alloys, 117246, Moscow, Russia

    V. N. Chepelenko

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  1. V. N. Chuvil’deev
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  2. A. V. Nokhrin
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  4. A. V. Piskunov
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  5. V. I. Kopylov
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Correspondence to A. V. Nokhrin.

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Translated by T. Gapontseva

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Chuvil’deev, V.N., Nokhrin, A.V., Shadrina, Y.S. et al. Thermal Stability of the Structure and Mechanical Properties of Fine-Grained Aluminum Conductor Alloys Al–Mg–Zr–Sc(Yb). Russ. Metall. 2020, 987–998 (2020). https://doi.org/10.1134/S0036029520090037

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