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Grain refinement in nanostructured Al–Mg alloys subjected to high pressure torsion

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Abstract

Nanostructures of three binary Al–Mg alloys and a commercial AA5182 alloy subjected to high pressure torsion at room temperature were comparatively investigated using transmission electron microscopy, high-resolution transmission electron microscopy, and X-ray line profile analysis. Grain size distributions, dislocation densities, and densities of planar defects including stacking faults and microtwins were quantified. The average subgrain size decreased considerably from 120 to 55 nm as the Mg content increased from 0.5 to 4.1 wt%. The average dislocation density in the alloys first increased to a maximum and then decreased as the Mg content increased and the average subgrain size decreased. The role of Mg solute on these features and the refinement mechanisms associated with the typical nanostructures and faults were interpreted.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (NSFC) under Grants No. 50971087 and the Research Council of Norway under the program SUP Light Metals Technology. One of the authors (T. U.) is grateful to the Hungarian National Science Foundation OTKA No. 67692 and No. 71594 for supporting this work. The authors also want to acknowledge the assistance of Dr. Lilya Kurmanaeva (Forschung Center of Karlsruhe, Germany), doing the tensile testing.

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Authors and Affiliations

  1. National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China

    Manping Liu & Xintao Liu

  2. Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Alfred Getz vei 2b, 7491, Trondheim, Norway

    Hans J. Roven

  3. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 K. Marx Street, Ufa, 450000, Russia

    Maxim Murashkin & Ruslan Z. Valiev

  4. Department of Materials Physics, Eötvös University, P.O. Box 32, Budapest, 1518, Hungary

    Tamas Ungár & Levente Balogh

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  1. Manping Liu
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  2. Hans J. Roven
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  3. Xintao Liu
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  4. Maxim Murashkin
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  5. Ruslan Z. Valiev
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  6. Tamas Ungár
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  7. Levente Balogh
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Correspondence to Manping Liu or Hans J. Roven.

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Liu, M., Roven, H.J., Liu, X. et al. Grain refinement in nanostructured Al–Mg alloys subjected to high pressure torsion. J Mater Sci 45, 4659–4664 (2010). https://doi.org/10.1007/s10853-010-4604-3

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  • DOI: https://doi.org/10.1007/s10853-010-4604-3

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