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Solute Clusters/Enrichment at the Early Stage of Ageing in Mg–Zn–Gd Alloys Studied by Atom Probe Tomography

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Three-dimensional distribution of solute elements in an Mg–Zn–Gd alloy during ageing process is quantitatively characterized by three-dimensional atom probe (3DAP) tomography. Based on the radius distribution function, it is found that Zn–Gd solute pairs in Mg matrix appear mainly at two peaks at early stage of ageing, and the separation distance between Zn and Gd atoms could be well rationalized by the first-principle calculation. Moreover, the fraction of Zn–Gd solute pairs increases first and then decreases due to the precipitation of long-period stacking ordered (LPSO) structures. Both the composition of the structural unit in LPSO structure and the solute enrichment around it are quantified. It is found that Zn and Gd elements are synchronized in the LPSO structure, and solute segregation of pure Zn or Gd is not observed at the transformation front of the LPSO structure in this alloy. In addition, the crystallography of transformation front is further determined by 3DAP data.

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Acknowledgements

This work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas, “Synchronized Long-Period Stacking Ordered Structure”, from the Ministry of Education, Culture, Sports, Science and Technology, Japan (No. 23109006), and Fundamental Research Funds for the Central Universities (No. FRF-TP-17-003A1). In addition, the organization of this symposium by Prof. R.Z. Wu (Harbin Engineering University) is greatly appreciated.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Xin-Fu Gu, Leng Chen & Ping Yang

  2. Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan

    Xin-Fu Gu & Tadashi Furuhara

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  1. Xin-Fu Gu
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  2. Tadashi Furuhara
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  3. Leng Chen
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  4. Ping Yang
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Correspondence to Xin-Fu Gu.

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Gu, XF., Furuhara, T., Chen, L. et al. Solute Clusters/Enrichment at the Early Stage of Ageing in Mg–Zn–Gd Alloys Studied by Atom Probe Tomography. Acta Metall. Sin. (Engl. Lett.) 32, 187–193 (2019). https://doi.org/10.1007/s40195-018-0840-3

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  • DOI: https://doi.org/10.1007/s40195-018-0840-3

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