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Impacts of Microalloying Elements on the Hardening β"-Phase in Automotive AlMgSi Alloys

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Microalloying elements play a crucial role in mechanical properties and phase stability of metallic alloys. In this work, we employ first-principles calculations and atomic-scale high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) to find promising microalloying elements that will improve the stability and properties of β"/Al interface and β" phase in Al–Mg-Si alloys. First, we define a substitution energy for evaluating the stability of β" phase and β"/Al interface with microalloying elements doped. Then, experiments of HAADF-STEM imaging are carried out to verify the calculational results. Next, using the most stable structures doped with microalloying elements, the mechanical properties of the β" bulk and the β"/Al interface were calculated and analyzed. At last, we have figured out the effects of all considered microalloying elements and obtained a rule that the stable occupancy of solute atoms is related to their own radius and the radius of Mg, Si, and Al. These findings will provide some theoretical basis for future microalloying strategies of Al–Mg-Si alloys.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (Nos. 52001119, 51831004, and 52171006) and the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. Center for High-Resolution Electron Microscopy, College of Materials Science & Engineering, Hunan University, Changsha, 410082, Hunan, China

    Zhaoqun Chen, Yuxiang Lai & Jianghua Chen

  2. College of Science, Central South University of Forestry and Technology, Changsha, 410004, China

    Linghong Liu

  3. Department of Physics and Key Laboratory for Low-Dimensional Structures and Quantum Manipulation (Ministry of Education), Hunan Normal University, Changsha, 410081, China

    Ziran Liu

Authors
  1. Zhaoqun Chen
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  2. Yuxiang Lai
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Correspondence to Yuxiang Lai or Ziran Liu.

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Chen, Z., Lai, Y., Liu, L. et al. Impacts of Microalloying Elements on the Hardening β"-Phase in Automotive AlMgSi Alloys. Acta Metall. Sin. (Engl. Lett.) 36, 495–506 (2023). https://doi.org/10.1007/s40195-022-01491-7

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