Microscopic Elastic Properties of Polycrystalline Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> Alloy with Long-Period Stacking Ordered 18R Phase Investigated by Inelastic X-ray Scattering

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  • Hosokawa Shinya
    Department of Physics, Graduate School of Science and Technology, Kumamoto University
  • Yamasaki Michiaki
    Magnesium Research Center, Kumamoto University Department of Materials Science, Graduate School of Science and Technology, Kumamoto University
  • Kawamura Yoshihito
    Magnesium Research Center, Kumamoto University Department of Materials Science, Graduate School of Science and Technology, Kumamoto University
  • Inui Masanori
    Graduate School of Integrated Arts and Sciences, Hiroshima University
  • Kajihara Yukio
    Graduate School of Integrated Arts and Sciences, Hiroshima University
  • Tsutsui Satoshi
    Japan Synchrotron Radiation Research Institute, SPring-8
  • Baron Alfred Q. R.
    Japan Synchrotron Radiation Research Institute, SPring-8 Materials Dynamics Laboratory, RIKEN SPring-8 Center, RIKEN

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  • Microscopic Elastic Properties of Polycrystalline Mg₈₅Zn₆Y₉ Alloy with Long-Period Stacking Ordered 18R Phase Investigated by Inelastic X-ray Scattering

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Inelastic X-ray scattering measurements were performed on polycrystalline Mg85Zn6Y9 alloy with long-period stacking ordered 18R phase to clarify the microscopic elastic properties. Tiny but clear excitation signals of longitudinal acoustic (LA) modes are observed in the whole Q range measured (Q < ∼16 nm−1). In addition, the transverse acoustic and unknown modes are detectable in the second Brillouin zone (∼13 < Q < ∼26 nm−1). The microscopic sound velocity of the LA modes is similar to the macroscopic value. The microscopic Poisson ratio is 0.22 ± 0.04, slightly smaller than the macroscopic value of 0.26 and usual metal values of ∼0.3, indicating a hard stiffness of the bond angles.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 56 (7), 914-916, 2015

    The Japan Institute of Metals and Materials

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