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Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys

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Abstract

The Hall–Petch relation has long been used to relate the yield strength of a metal to its grain sizes in which the effectiveness of grain size strengthening in the metal is dictated by the Hall–Petch coefficient (slope). Therefore, understanding the microstructural dependence of the Hall–Petch slope would be very useful in designing new high-strength ultrafine grained (UFG) metallic materials. In this study, we investigated the microstructural factors affecting the Hall–Petch slope in UFG Al-Mg alloys with an average grain size range from 374 to 639 nm and different Mg contents of 0, 2.5, 5, and 7.5 at. pct. The rods prepared by extrusion of mechanically alloyed powder compacts were annealed for 5 hours at 380 °C, 420 °C, and 500 °C respectively followed by water quenching to produce the alloy samples in this study. The measured Hall–Petch slopes of the samples were found to increase with increasing Mg content and had higher values than those previously reported for Al(Mg) solid solutions with Mg concentrations comparable to the Mg contents in this study. Analysis of X-ray diffraction, transmission electron microscopy, and atom probe tomography experimental data as well as strengthening mechanisms demonstrates that the formation of nanoscale MgO dispersions plays a major role in the improved Hall–Petch slope observed in Al-Mg alloys.

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Acknowledgments

D.S. Zhou is grateful to the financial support from the Natural Science Foundation of China (Grant No. 51701036) and the Fundamental Research Funds for the Central Universities (Grant No. N160203001) to conduct this study. D.S. Zhou wishes to thank Prof. Dierk Raabe for his valuable discussion and comments.

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Authors and Affiliations

  1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, 110819, China

    Dengshan Zhou, Hao Wang, Hongwei Geng & Deliang Zhang

  2. Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China

    Dengshan Zhou, Hao Wang, Hongwei Geng & Deliang Zhang

  3. Australian Nuclear Science and Technology Organization (ANSTO), Sydney, NSW, 2234, Australia

    Ondrej Muránsky

  4. School of Materials Science and Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia

    Ondrej Muránsky

  5. Geoscience Atom Probe, Advanced Resource Characterization Facility, John de Laeter Centre, Curtin University, Bentley, 6845, Australia

    David W. Saxey, William D. A. Rickard & Steven M. Reddy

  6. Microscopy and Microanalysis Facility, John de Laeter Centre, Curtin University, Bentley, 6845, Australia

    Zakaria Quadir

  7. Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Chao Yang

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  1. Dengshan Zhou
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Manuscript submitted December 20, 2018.

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Zhou, D., Wang, H., Saxey, D.W. et al. Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys. Metall Mater Trans A 50, 4047–4057 (2019). https://doi.org/10.1007/s11661-019-05329-3

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