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Effect of Grain Refinement on Jerky Flow in an Al-Mg-Sc Alloy

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Abstract

The influence of microstructure on the manifestations of the Portevin–Le Chatelier (PLC) effect was studied in an Al-Mg-Sc alloy with unrecrystallized, partially recrystallized, and fully recrystallized grain structures. It was found that the extensive grain refinement promotes plastic instability: the temperature–strain rate domain of the PLC effect becomes wider and the critical strain for the onset of serrations decreases. Besides, the amplitude of regular stress serrations observed at room temperature and an intermediate strain rate increases several times, indicating a strong increase of the contribution of solute solution hardening to the overall strength. Moreover, the grain refinement affects the usual sequence of the characteristic types of stress serrations, which characterize the dynamical mechanisms governing a highly heterogeneous unstable plastic flow. Finally, it reduces the strain localization and surface roughness and diminishes the difference between the surface markings detected in the necked area and in the region of uniform elongation.

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Acknowledgments

The financial support received from the Ministry of Education and Science, Russia, (Belgorod State University Project No. 11.1533.2014/K) is acknowledged. The main results were obtained by using equipment of Joint Research Center, Belgorod State University. T. L. acknowledges support by the Center of Excellence “LabEx DAMAS” through the French State program “Investment in the future” (Grant ANR-11-LABX-0008-01 of the French National Research Agency).

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Authors and Affiliations

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

    Anna Mogucheva (Senior Research Associate), Diana Yuzbekova (Engineer) & Rustam Kaibyshev (Head)

  2. Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), CNRS UMR 7239, Université de Lorraine, Ile du Saulcy, 57045, Metz, France

    Tatiana Lebedkina (Research Fellow) & Mikhail Lebyodkin (Head)

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  1. Anna Mogucheva
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  2. Diana Yuzbekova
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Correspondence to Anna Mogucheva.

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Manuscript submitted November 5, 2015.

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Mogucheva, A., Yuzbekova, D., Kaibyshev, R. et al. Effect of Grain Refinement on Jerky Flow in an Al-Mg-Sc Alloy. Metall Mater Trans A 47, 2093–2106 (2016). https://doi.org/10.1007/s11661-016-3381-2

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