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Microstructural Evolution of Long-Period Stacking Ordered Structures in Mg97Y2Zn1 Alloys Examined by In-Situ Small-Angle X-ray Scattering

  • Symposium: Neutron and X-Ray Studies of Advanced Materials VII
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Abstract

Development and stability of synchronized long-period stacking ordered (LPSO) structures in Mg97Y2Zn1 alloy were examined by synchrotron-radiation small- and wide-angle scattering/diffraction measurements. The main LPSO structure in the as-cast polycrystalline ingot was 18R, and 14H structure grew at the cost of 18R during annealing. The in-plane peak position increased for longer annealing times in isothermal annealing and also at higher temperatures during in situ heating measurements, and it was interpreted by a composition of peaks corresponding to several sites. The experimental instability temperatures obtained by in situ measurements for in-plane ordering, 18R, and 14H structures agreed within experimental resolution.

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Notes

  1. PYREX is a trademark of Corning Incorporated, Corning, NY.

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Acknowledgments

The present 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, Science, Sport and Culture, Japan (Grant No. 23109005). Small-angle scattering measurements were made under Proposal Nos. 2012G118 at Photon Factory, KEK, and 2013A1447 and 2013B1383 at SPring-8.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto, 606-8501, Japan

    Hiroshi Okuda (Associate Professor), Toshiki Horiuchi (Graduate Student) & Shoki Hifumi (Graduate Student)

  2. Department of Materials Science and Engineering, Kumamoto University, Kurokami, Kumamoto, 860-8555, Japan

    Michiaki Yamasaki (Associate Professor) & Yoshihito Kawamura (Professor)

  3. Japan Synchrotron Radiation Research Institute, Synchrotron Radiation Instrumentation/measurements (JASRI), SPring-8, Sayo, 679-5198, Japan

    Shigeru Kimura (Group Leader, Associate Chief Scientist)

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  1. Hiroshi Okuda
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  2. Toshiki Horiuchi
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  3. Shoki Hifumi
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  4. Michiaki Yamasaki
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  5. Yoshihito Kawamura
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Corresponding author

Correspondence to Hiroshi Okuda.

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Manuscript submitted February 14, 2014.

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Okuda, H., Horiuchi, T., Hifumi, S. et al. Microstructural Evolution of Long-Period Stacking Ordered Structures in Mg97Y2Zn1 Alloys Examined by In-Situ Small-Angle X-ray Scattering. Metall Mater Trans A 45, 4780–4785 (2014). https://doi.org/10.1007/s11661-014-2410-2

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  • DOI: https://doi.org/10.1007/s11661-014-2410-2

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