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Fatigue Performance of Friction-Stir-Welded Al-Mg-Sc Alloy

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Abstract

Fatigue behavior of a friction-stir-welded Al-Mg-Sc alloy was examined in cast and hot-rolled conditions. In both cases, the joints failed in the base material region and therefore the joint efficiency was 100 pct. The specimens machined entirely from the stir zone demonstrated fatigue strength superior to that of the base material in both preprocessed tempers. It was shown that the excellent fatigue performance of friction-stir joints was attributable to the ultra-fine-grained microstructure, the low dislocation density evolved in the stir zone, and the preservation of Al3Sc coherent dispersoids during welding. The formation of such structure hinders the initiation and growth of fatigue microcracks that provides superior fatigue performance of friction-stir welds.

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Notes

  1. Since the microstructure, texture, and microhardness values of stir zone materials in both studied material conditions (i.e. cast and hot rolled ones) were found to be broadly similar,[17] the fatigue behavior was also assumed to be the same in both cases. Therefore, the fatigue specimens were machined from the stir zone of FSW-processed cast material only.

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Acknowledgments

The financial support received from the Ministry of Education and Science, Russia (Belgorod State University Project No. 1533) is acknowledged.

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Authors and Affiliations

  1. Laboratory of Mechanical Properties of Nanostructural Materials and Superalloys, Belgorod State University, Pobeda 85, Belgorod, Russia, 308015

    Daria Zhemchuzhnikova (Researcher) & Rustam Kaibyshev (Professor)

  2. Department of Materials Processing, Graduate School of Engineering, Tohoku University, 6-6-02 Aramaki-aza-Aoba, Sendai, 980-8579, Japan

    Sergey Mironov (Researcher)

Authors
  1. Daria Zhemchuzhnikova
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  2. Sergey Mironov
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  3. Rustam Kaibyshev
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Correspondence to Daria Zhemchuzhnikova.

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Manuscript submitted October 15, 2015.

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Zhemchuzhnikova, D., Mironov, S. & Kaibyshev, R. Fatigue Performance of Friction-Stir-Welded Al-Mg-Sc Alloy. Metall Mater Trans A 48, 150–158 (2017). https://doi.org/10.1007/s11661-016-3843-6

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